juaristi22 · Oct 27, 2026 · Oct 26, 2026 · Oct 26, 2026 · Oct 26, 2026
diff --git a/...d/certify-uk-microcosm-uk-2024-25-national-20261025T091414Z-a6299504.changed.md b/...d/certify-uk-microcosm-uk-2024-25-national-20261025T091414Z-a6299504.changed.md
@@ -0,0 +1 @@
+Certify the Microcosm UK pair built on policyengine-uk 2.151.0 (microcosm `67ee2ddf3`): the national cut `microcosm-uk-2024-25-national-20261025T091414Z-a6299504` (`microcosm_uk_2024_25`) and, for constituency and local-authority regions, the local-area cut `microcosm-uk-2024-25-dense-20261026T105309Z-c9df4b86` (`microcosm_uk_2024_25_dense`), both built from one spine. The UK model pin moves from policyengine-uk 2.132.6 to 2.151.0 (policyengine-core stays 3.33.3), so UK results change with both the model and the data. From policyengine-uk 2.134.0 a capital gains tax reform scales realised gains by a retention-rate elasticity of 1 by default (`gov.simulation.capital_gains_responses.elasticity`); set it to 0 for a static costing. With a Hugging Face token set, importing policyengine with any policyengine-uk other than 2.151.0 raises.
diff --git a/pyproject.toml b/pyproject.toml
@@ -42,12 +42,12 @@ graph = [
 models = [
     "policyengine-core==3.33.3",
     "policyengine-us==2.2.1",
-    "policyengine-uk==2.132.6",
+    "policyengine-uk==2.151.0",
     "spm-calculator==1.0.0",
 ]
 uk = [
     "policyengine-core==3.33.3",
-    "policyengine-uk==2.132.6",
+    "policyengine-uk==2.151.0",
 ]
 us = [
     "policyengine-core==3.33.3",
@@ -72,7 +72,7 @@ dev = [
     "rfc8785>=0.1.4",
     "policyengine-core==3.33.3",
     "policyengine-us==2.2.1",
-    "policyengine-uk==2.132.6",
+    "policyengine-uk==2.151.0",
     "spm-calculator==1.0.0",
 ]
 

diff --git a/src/policyengine/data/bundle/manifest.json b/src/policyengine/data/bundle/manifest.json
@@ -16,31 +16,31 @@
   },
   "data_releases": {
     "uk": {
-      "build_id": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
+      "build_id": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
       "bundle_id": "uk-6.11.0",
       "certification": {
-        "built_with_model_version": "2.132.6",
+        "built_with_model_version": "2.151.0",
         "certified_by": "policyengine.py bundle certification",
-        "certified_for_model_version": "2.132.6",
+        "certified_for_model_version": "2.151.0",
         "compatibility_basis": "built_with_model_package",
         "core_binding": "bundle_pin",
-        "data_build_id": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71"
+        "data_build_id": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504"
       },
       "certified_data_artifact": {
-        "build_id": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
+        "build_id": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
         "data_package": {
           "name": "microcosm-data",
           "version": "0.1.0"
         },
         "dataset": "microcosm_uk_2024_25",
-        "sha256": "810ba980005a8b907cb51464279fa5e0125464b7af9a4871b7f6744c30951ece",
-        "uri": "hf://policyengine/populace-uk-private/microcosm_uk_2024_25.h5@microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71"
+        "sha256": "b96a8cd625b645a409c063b1de5158532708a2f0d3c3897a794a8fb0bbd5064e",
+        "uri": "hf://policyengine/populace-uk-private/microcosm_uk_2024_25.h5@microcosm-uk-2024-25-national-20261025T091414Z-a6299504"
       },
       "country_id": "uk",
       "data_package": {
         "name": "microcosm-data",
         "release_manifest_path": "releases/microcosm-uk-2024-25-national/release_manifest.json",
-        "release_manifest_revision": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
+        "release_manifest_revision": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
         "repo_id": "policyengine/populace-uk-private",
         "repo_type": "dataset",
         "version": "0.1.0"
@@ -50,66 +50,66 @@
         "calibration_diagnostics": {
           "path": "releases/microcosm-uk-2024-25-national/calibration_diagnostics.json",
           "repo_id": "policyengine/populace-uk-private",
-          "revision": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
-          "sha256": "34978e2bfde3f2641769c9c3a8f60455c59ecae5a50524b359d74388d7edc888"
+          "revision": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
+          "sha256": "e61a60a1a8d57204be15600b2f98dbc864123589d48ede8414ebe43139d7c09b"
         },
         "microcosm_uk_2024_25": {
           "path": "microcosm_uk_2024_25.h5",
           "repo_id": "policyengine/populace-uk-private",
-          "revision": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
-          "sha256": "810ba980005a8b907cb51464279fa5e0125464b7af9a4871b7f6744c30951ece"
+          "revision": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
+          "sha256": "b96a8cd625b645a409c063b1de5158532708a2f0d3c3897a794a8fb0bbd5064e"
         },
         "microcosm_uk_2024_25_calibration": {
           "path": "microcosm_uk_2024_25_calibration.npz",
           "repo_id": "policyengine/populace-uk-private",
-          "revision": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
-          "sha256": "104a8253bf1aebc91147c9bbb40e2603d1025317ba8c6b991383d5e4d91852c2"
+          "revision": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
+          "sha256": "96756884d719fa969c2fbdf548f4e56b8311c0c3765c66b1bf9bc8fe862f718f"
         },
         "microcosm_uk_2024_25_dense": {
           "path": "microcosm_uk_2024_25_dense.h5",
           "repo_id": "policyengine/populace-uk-private",
           "repo_type": "dataset",
-          "revision": "microcosm-uk-2024-25-dense-20261019T000432Z-ee5c2dbe",
-          "sha256": "8e10e130d0260e0b52e2e29902f0502ebdff76a14a3e57d2c876bf4cd8db5872"
+          "revision": "microcosm-uk-2024-25-dense-20261026T105309Z-c9df4b86",
+          "sha256": "cb3712f25b76109ad27b7b0cdf5dee78c55d3b7f55ce7bf207ef1a191da2ae9a"
         },
         "release_certification": {
           "path": "releases/microcosm-uk-2024-25-national/release_certification.json",
           "repo_id": "policyengine/populace-uk-private",
-          "revision": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
-          "sha256": "6a68cc93595fc5a7ad451d75a902523c25659de27014f50431dd5e19af5bd959"
+          "revision": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
+          "sha256": "fc657f7ec9a759d15d4ad683ab92d5324f37844667d9d54b6d0648108419cf59"
         },
         "release_cut_gates": {
           "path": "releases/microcosm-uk-2024-25-national/release_cut_gates.json",
           "repo_id": "policyengine/populace-uk-private",
-          "revision": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
-          "sha256": "c91c1364d9c3be98493039d4e1dd8c2256881a434c1f124dd2ed0701bfaf7751"
+          "revision": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
+          "sha256": "54312402dc3152ab46208f89c86e5d8bf0dce13dfc723171f5a2c08a826217cd"
         },
         "score_vs_enhanced_frs": {
           "path": "releases/microcosm-uk-2024-25-national/score_vs_enhanced_frs.json",
           "repo_id": "policyengine/populace-uk-private",
-          "revision": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
-          "sha256": "ba8a675f36e7c836bf5521e5933e21bb689442734b7340e05cabd3e0cc55323d"
+          "revision": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
+          "sha256": "9e80102acf02a09a70ba3f45d7e6da2d33178476840388d640105f36ee353bd2"
         },
         "spine_gates": {
           "path": "releases/microcosm-uk-2024-25-national/spine_gates.json",
           "repo_id": "policyengine/populace-uk-private",
-          "revision": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
-          "sha256": "6dbba976dd1304c07da531382cecb11c9cb69512de0ee65126b71f032a0f37d6"
+          "revision": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
+          "sha256": "6856e437f4fa12a07ffe346a8f070b56d9a05c8dbece3eb277c293e75a0e582b"
         },
         "terminal_gates": {
           "path": "releases/microcosm-uk-2024-25-national/terminal_gates.json",
           "repo_id": "policyengine/populace-uk-private",
-          "revision": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
-          "sha256": "e29439d5ce0ea098d32579284ac06f26f086feba2fb8d12d1e88ac9a54840808"
+          "revision": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
+          "sha256": "cffa3db6734604c4fb7176bb81def41d313a8df26a2a2f675a970a6e9899a644"
         }
       },
       "default_dataset": "microcosm_uk_2024_25",
-      "default_dataset_uri": "hf://policyengine/populace-uk-private/microcosm_uk_2024_25.h5@microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
+      "default_dataset_uri": "hf://policyengine/populace-uk-private/microcosm_uk_2024_25.h5@microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
       "model_package": {
         "name": "policyengine-uk",
-        "sha256": "cc54025f2a3bc54be4f8d024d1e6f11ed29fed75ca513b214f2d2963c5bf4354",
-        "version": "2.132.6",
-        "wheel_url": "https://files.pythonhosted.org/packages/11/f2/c003cd7a95cb499737a5b8af0d619ba4e759c8bc7e55a2bb5c7efa46abd1/policyengine_uk-2.132.6-py3-none-any.whl"
+        "sha256": "5722f55aca3eb88e1a228e95e1a57e3bd70a4d530a5a000991565ebd8955ce35",
+        "version": "2.151.0",
+        "wheel_url": "https://files.pythonhosted.org/packages/42/15/610c6825ed934d4338a42707b8c021e5627738e68224b6672df94770295c/policyengine_uk-2.151.0-py3-none-any.whl"
       },
       "policyengine_version": "6.11.0",
       "region_datasets": {
@@ -124,12 +124,12 @@
         }
       },
       "regional_release_kind": "local_area",
-      "regional_release_manifest_uri": "https://huggingface.co/datasets/policyengine/populace-uk-private/resolve/microcosm-uk-2024-25-dense-20261019T000432Z-ee5c2dbe/releases/microcosm-uk-2024-25-dense/release_manifest.json",
-      "regional_source_manifest_uri": "hf://dataset/policyengine/populace-uk-private@microcosm-uk-2024-25-dense-20261019T000432Z-ee5c2dbe/releases/microcosm-uk-2024-25-dense/release_manifest.json",
-      "release_manifest_uri": "https://huggingface.co/datasets/policyengine/populace-uk-private/resolve/microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71/releases/microcosm-uk-2024-25-national/release_manifest.json",
+      "regional_release_manifest_uri": "https://huggingface.co/datasets/policyengine/populace-uk-private/resolve/microcosm-uk-2024-25-dense-20261026T105309Z-c9df4b86/releases/microcosm-uk-2024-25-dense/release_manifest.json",
+      "regional_source_manifest_uri": "hf://dataset/policyengine/populace-uk-private@microcosm-uk-2024-25-dense-20261026T105309Z-c9df4b86/releases/microcosm-uk-2024-25-dense/release_manifest.json",
+      "release_manifest_uri": "https://huggingface.co/datasets/policyengine/populace-uk-private/resolve/microcosm-uk-2024-25-national-20261025T091414Z-a6299504/releases/microcosm-uk-2024-25-national/release_manifest.json",
       "schema_version": 1,
-      "source_manifest_uri": "hf://dataset/policyengine/populace-uk-private@microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71/releases/microcosm-uk-2024-25-national/release_manifest.json",
-      "version": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71"
+      "source_manifest_uri": "hf://dataset/policyengine/populace-uk-private@microcosm-uk-2024-25-national-20261025T091414Z-a6299504/releases/microcosm-uk-2024-25-national/release_manifest.json",
+      "version": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504"
     },
     "us": {
       "build_id": "populace-us-2024-spm-20260915",
@@ -363,10 +363,10 @@
     "policyengine-uk": {
       "country": "uk",
       "import_name": "policyengine_uk",
-      "install_requirement": "policyengine-uk==2.132.6",
+      "install_requirement": "policyengine-uk==2.151.0",
       "name": "policyengine-uk",
       "role": "country_model",
-      "version": "2.132.6"
+      "version": "2.151.0"
     },
     "policyengine-us": {
       "country": "us",

diff --git a/src/policyengine/data/bundle/uk.trace.tro.jsonld b/src/policyengine/data/bundle/uk.trace.tro.jsonld
@@ -17,7 +17,7 @@
         "schema:name": "PolicyEngine",
         "schema:url": "https://policyengine.org"
       },
-      "schema:dateCreated": "2026-10-19T10:17:15.545356+00:00",
+      "schema:dateCreated": "2026-10-25T10:57:31.393341+00:00",
       "schema:description": "TRACE TRO for certified runtime bundle uk-6.11.0 covering the bundle manifest, the certified dataset artifact, the country model wheel, and the country data release manifest when it is available.",
       "schema:name": "policyengine uk certified bundle TRO",
       "trov:createdWith": {
@@ -45,23 +45,23 @@
               "trov:hasArtifact": {
                 "@id": "composition/1/artifact/data_release_manifest"
               },
-              "trov:hasLocation": "https://huggingface.co/datasets/policyengine/populace-uk-private/resolve/microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71/releases/microcosm-uk-2024-25-national/release_manifest.json"
+              "trov:hasLocation": "https://huggingface.co/datasets/policyengine/populace-uk-private/resolve/microcosm-uk-2024-25-national-20261025T091414Z-a6299504/releases/microcosm-uk-2024-25-national/release_manifest.json"
             },
             {
               "@id": "arrangement/1/location/dataset",
               "@type": "trov:ArtifactLocation",
               "trov:hasArtifact": {
                 "@id": "composition/1/artifact/dataset"
               },
-              "trov:hasLocation": "https://huggingface.co/datasets/policyengine/populace-uk-private/resolve/microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71/microcosm_uk_2024_25.h5"
+              "trov:hasLocation": "https://huggingface.co/datasets/policyengine/populace-uk-private/resolve/microcosm-uk-2024-25-national-20261025T091414Z-a6299504/microcosm_uk_2024_25.h5"
             },
             {
               "@id": "arrangement/1/location/model_wheel",
               "@type": "trov:ArtifactLocation",
               "trov:hasArtifact": {
                 "@id": "composition/1/artifact/model_wheel"
               },
-              "trov:hasLocation": "https://files.pythonhosted.org/packages/11/f2/c003cd7a95cb499737a5b8af0d619ba4e759c8bc7e55a2bb5c7efa46abd1/policyengine_uk-2.132.6-py3-none-any.whl"
+              "trov:hasLocation": "https://files.pythonhosted.org/packages/42/15/610c6825ed934d4338a42707b8c021e5627738e68224b6672df94770295c/policyengine_uk-2.151.0-py3-none-any.whl"
             }
           ]
         }
@@ -75,51 +75,51 @@
             "@type": "trov:ResearchArtifact",
             "schema:name": "policyengine.py bundle manifest for uk",
             "trov:mimeType": "application/json",
-            "trov:sha256": "bccf23acde631aed4665757094c04f86e60993fb9d388e7dc958b90c876e5a80"
+            "trov:sha256": "93556c99569af70d6a49c3c6f20e17638521d4d9e32724ab516243f2a2be7eaa"
           },
           {
             "@id": "composition/1/artifact/data_release_manifest",
             "@type": "trov:ResearchArtifact",
             "schema:name": "microcosm-data release manifest 0.1.0",
             "trov:mimeType": "application/json",
-            "trov:sha256": "49f9fa820db2e6544ff5cdceeb2d868a504843a6a1c1c06b37188621e700066f"
+            "trov:sha256": "1ebdbcc37535858c995e2d7434074f4ab89521e7b64f9b539a0684906f800e49"
           },
           {
             "@id": "composition/1/artifact/dataset",
             "@type": "trov:ResearchArtifact",
             "schema:name": "microcosm_uk_2024_25",
             "trov:mimeType": "application/x-hdf5",
-            "trov:sha256": "810ba980005a8b907cb51464279fa5e0125464b7af9a4871b7f6744c30951ece"
+            "trov:sha256": "b96a8cd625b645a409c063b1de5158532708a2f0d3c3897a794a8fb0bbd5064e"
           },
           {
             "@id": "composition/1/artifact/model_wheel",
             "@type": "trov:ResearchArtifact",
-            "schema:name": "policyengine-uk==2.132.6 wheel",
+            "schema:name": "policyengine-uk==2.151.0 wheel",
             "trov:mimeType": "application/zip",
-            "trov:sha256": "cc54025f2a3bc54be4f8d024d1e6f11ed29fed75ca513b214f2d2963c5bf4354"
+            "trov:sha256": "5722f55aca3eb88e1a228e95e1a57e3bd70a4d530a5a000991565ebd8955ce35"
           }
         ],
         "trov:hasFingerprint": {
           "@id": "composition/1/fingerprint",
           "@type": "trov:CompositionFingerprint",
-          "trov:sha256": "a6de911691f376d0092d99528b8592e60e65e8766a979cd7f7ea0a12d96f1a92"
+          "trov:sha256": "63d795c6e09e37954c193f1d0a08b1b61ab1ccc75fd1181f830431750ae8fe4b"
         }
       },
       "trov:hasPerformance": {
         "@id": "trp/1",
         "@type": "trov:TransparentResearchPerformance",
-        "pe:builtWithModelVersion": "2.132.6",
+        "pe:builtWithModelVersion": "2.151.0",
         "pe:certifiedBy": "policyengine.py bundle certification",
-        "pe:certifiedForModelVersion": "2.132.6",
+        "pe:certifiedForModelVersion": "2.151.0",
         "pe:compatibilityBasis": "built_with_model_package",
         "pe:coreBinding": "bundle_pin",
-        "pe:dataBuildId": "microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71",
+        "pe:dataBuildId": "microcosm-uk-2024-25-national-20261025T091414Z-a6299504",
         "pe:emittedIn": "repository-bundle",
-        "rdfs:comment": "Certification of build microcosm-uk-2024-25-national-20261019T083323Z-6cba5d71 for policyengine-uk 2.132.6.",
+        "rdfs:comment": "Certification of build microcosm-uk-2024-25-national-20261025T091414Z-a6299504 for policyengine-uk 2.151.0.",
         "trov:accessedArrangement": {
           "@id": "arrangement/1"
         },
-        "trov:startedAtTime": "2026-10-19T10:17:15.545356+00:00",
+        "trov:startedAtTime": "2026-10-25T10:57:31.393341+00:00",
         "trov:wasConductedBy": {
           "@id": "trs"
         }

diff --git a/src/policyengine/data/bundle/us.trace.tro.jsonld b/src/policyengine/data/bundle/us.trace.tro.jsonld
@@ -74,7 +74,7 @@
             "@type": "trov:ResearchArtifact",
             "schema:name": "policyengine.py bundle manifest for us",
             "trov:mimeType": "application/json",
-            "trov:sha256": "bccf23acde631aed4665757094c04f86e60993fb9d388e7dc958b90c876e5a80"
+            "trov:sha256": "93556c99569af70d6a49c3c6f20e17638521d4d9e32724ab516243f2a2be7eaa"
           },
           {
             "@id": "composition/1/artifact/data_release_manifest",
@@ -101,7 +101,7 @@
         "trov:hasFingerprint": {
           "@id": "composition/1/fingerprint",
           "@type": "trov:CompositionFingerprint",
-          "trov:sha256": "3c63dadd4e5c01ee40268ce3ba9ce433cf911b163adac88126ee6e8c6f4fb319"
+          "trov:sha256": "3c17ca543cf560848ed35f296279cb6c0d86660fa6148882baccf9d0446b4cf2"
         }
       },
       "trov:hasPerformance": {

diff --git a/tests/fixtures/household_calculator_snapshots/uk_couple_two_kids.json b/tests/fixtures/household_calculator_snapshots/uk_couple_two_kids.json
@@ -13,14 +13,14 @@
   "household.equiv_hbai_household_net_income": 52510.29,
   "household.fuel_duty": 0.0,
   "household.hbai_household_net_income": 73514.4,
-  "household.household_benefits": 9441.78,
+  "household.household_benefits": 9872.8,
   "household.household_count_people": 4.0,
-  "household.household_gross_income": 99441.78,
+  "household.household_gross_income": 99872.8,
   "household.household_id": 0.0,
   "household.household_income_decile": 10.0,
   "household.household_market_income": 90000.0,
-  "household.household_net_income": 80438.73,
-  "household.household_tax": 19003.05,
+  "household.household_net_income": 80869.8,
+  "household.household_tax": 19003.0,
   "household.household_wealth_decile": 10.0,
   "household.household_weight": 1.0,
   "household.in_poverty_ahc": 0.0,

diff --git a/tests/fixtures/household_calculator_snapshots/uk_model_surface.json b/tests/fixtures/household_calculator_snapshots/uk_model_surface.json
@@ -5,7 +5,7 @@
   "has_income_tax": true,
   "has_region_registry": true,
   "model_package_name": "policyengine-uk",
-  "num_parameters_bucketed_100s": 32,
-  "num_variables_bucketed_100s": 11,
+  "num_parameters_bucketed_100s": 42,
+  "num_variables_bucketed_100s": 12,
   "region_registry_country": "uk"
 }
diff --git a/tests/fixtures/household_calculator_snapshots/uk_single_adult_employment_income.json b/tests/fixtures/household_calculator_snapshots/uk_single_adult_employment_income.json
@@ -19,8 +19,8 @@
   "household.household_id": 0.0,
   "household.household_income_decile": 10.0,
   "household.household_market_income": 30000.0,
-  "household.household_net_income": 24939.55,
-  "household.household_tax": 5060.45,
+  "household.household_net_income": 24939.6,
+  "household.household_tax": 5060.4,
   "household.household_wealth_decile": 10.0,
   "household.household_weight": 1.0,
   "household.in_poverty_ahc": 0.0,

diff --git a/tests/fixtures/household_calculator_snapshots/uk_single_adult_no_income.json b/tests/fixtures/household_calculator_snapshots/uk_single_adult_no_income.json
@@ -19,8 +19,8 @@
   "household.household_id": 0.0,
   "household.household_income_decile": 10.0,
   "household.household_market_income": 0.0,
-  "household.household_net_income": 4918.75,
-  "household.household_tax": 180.04,
+  "household.household_net_income": 4918.8,
+  "household.household_tax": 180.0,
   "household.household_wealth_decile": 10.0,
   "household.household_weight": 1.0,
   "household.in_poverty_ahc": 1.0,
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Certify the Microcosm UK pair built on policyengine-uk 2.151.0 (microcosm `67ee2ddf3`): the national cut `microcosm-uk-2024-25-national-20261025T091414Z-a6299504` (`microcosm_uk_2024_25`) and, for constituency and local-authority regions, the local-area cut `microcosm-uk-2024-25-dense-20261026T105309Z-c9df4b86` (`microcosm_uk_2024_25_dense`), both built from one spine. The UK model pin moves from policyengine-uk 2.132.6 to 2.151.0 (policyengine-core stays 3.33.3), so UK results change with both the model and the data. From policyengine-uk 2.134.0 a capital gains tax reform scales realised gains by a retention-rate elasticity of 1 by default (`gov.simulation.capital_gains_responses.elasticity`); set it to 0 for a static costing. With a Hugging Face token set, importing policyengine with any policyengine-uk other than 2.151.0 raises.