Where was The Abominable Bride filmed?

2016 special episode of BBC's Sherlock directed by Douglas Mackinnon

The Abominable Bride (2016) was filmed in Bristol, Bath, Somerset, Gloucester Cathedral, Wraxall, Tyntesfield and 2 more places, 8 places named in its Wikipedia article, in the United Kingdom. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data