May 2026 OS Boundary-Line

mapit_gb/controls/2026-05.py

@@ -0,0 +1,56 @@
+# A control file for importing Boundary-Line.
+# CEDs (county council electoral divisions) don't have ONS codes, so we have to
+# have something manual as this is a year of county council boundary changes.
+#
+# OS release notes are at
+# https://docs.os.uk/os-downloads/products/areas-and-zones-portfolio/boundary-line/release-notes/may-2026
+#
+# The following English counties have had full boundary changes:
+# Essex, Norfolk, Suffolk.
+# Unitaries with boundary changes are the following, but we spot them
+# automatically by GSS code: Milton Keynes, Swindon, Thurrock.
+# And lots of MTDs as well.
+
+from mapit.models import Area, Generation
+
+COUNTIES_CHANGED = ["%s County Council" % c for c in [
+    'Essex', 'Norfolk', 'Suffolk'
+]]
+COUNTIES_NOT_CHANGED = ["%s County Council" % c for c in [
+    'Cambridgeshire', 'Derbyshire', 'Devon', 'Dorset', 'East Sussex',
+    'Gloucestershire', 'Hampshire', 'Hertfordshire', 'Kent', 'Lancashire',
+    'Leicestershire', 'Lincolnshire', 'Oxfordshire', "Northamptonshire",
+    "North Yorkshire", 'Nottinghamshire', "Somerset", 'Staffordshire',
+    "Surrey", 'Warwickshire', 'West Sussex', 'Worcestershire'
+]]
+
+
+def code_version():
+    return 'gss'
+
+
+def check(name, type, country, geometry, ons_code, commit, **args):
+    """Should return True if this area is NEW, False if we should match against
+    an ONS/unit_id code, or an Area to be used as an override instead."""
+
+    current = Generation.objects.current()
+    if not current:  # Fresh import
+        return False
+
+    # We already have ONS codes in our system for the Welsh Parliament,
+    # and we want these to go in as new entries
+    if type == 'WAC':
+        return True
+
+    # Some UTAs have had boundary changes, but have ONS codes and so can be
+    # ignored/ detected that way.
+    if type != 'CED':
+        return False
+
+    # Make sure CEDs are loaded *after* CTY
+    area_within = Area.objects.filter(type__code='CTY', polygons__polygon__contains=geometry.geos.point_on_surface)[0]
+    if area_within.name in COUNTIES_CHANGED:
+        return True
+    elif area_within.name in COUNTIES_NOT_CHANGED:
+        return False
+    raise Exception("Bad county name given: %s" % area_within.name)

mapit_gb/controls/possible-future.py

@@ -21,7 +21,7 @@ def check(name, type, country, geometry, **args):
 
     # Make sure CEDs are loaded *after* CTY
     area_within = Area.objects.filter(type__code='CTY', polygons__polygon__contains=geometry.geos.point_on_surface)[0]
-    if re.search('Buckinghamshire(?i)', area_within.name):
+    if re.search('(?i)Buckinghamshire', area_within.name):
         return True
 
     return False

mapit_gb/management/commands/mapit_UK_find_parents.py

@@ -26,8 +26,6 @@ class Command(FindParentsCommand):
         'UTW': ('UTA', 'COI'),
         # A Scottish Parliament constituency's parent is a Scottish Parliament region:
         'SPC': 'SPE',
-        # A Welsh Assembly constituency's parent is a Welsh Assembly region:
-        'WAC': 'WAE',
         # A Civil Parish's parent is one of:
         #   District council
         #   Unitary Authority

mapit_gb/management/commands/mapit_UK_import_boundary_line.py

@@ -52,7 +52,7 @@ def handle_label(self, filename, **options):
             if not isinstance(name, str):
                 name = name.decode('iso-8859-1')
 
-            name = re.sub(r'\s*\(DET( NO \d+|)\)\s*(?i)', '', name)
+            name = re.sub(r'(?i)\s*\(DET( NO \d+|)\)\s*', '', name)
             name = re.sub(r'\s+', ' ', name)
 
             ons_code = feat['CODE'].value if feat['CODE'].value not in ('999999', '999999999') else None