I am working on a map that requires second-level subdivisions for the United Kingdom, looking for these in shapefile format. These would be county-level subdivisions. I've done a lot of searching at the data.gov.uk website and also at Ordnance Survey GIS data download website but I can' t seem to find the right shapefile.
Ideally the shapefile should have the second level subdivisions that match the current Wikipedia resource at https://en.wikipedia.org/wiki/ISO_3166-2:GB#Second-level_subdivisions, so Buckinghamshire should have the code GB-BKM in the shapefile, Cambridgshire should have the coding GB-CAM Cambridgeshire, and Cumbria should have the coding GB-CMA.
Does anyone know of a download link from data.gov.uk or another UK government website that has this? I've done numerous online and Google searches. I found this one one on ceremonial counties - https://data.gov.uk/dataset/ceremonial-county-boundaries-of-england but it doesn't seem like the right one. And I'm Canadian, so I'm confused by the different offerings out there such as Ceremonial counties, and historical counties, unary, etc.