I was just looking at the rare values at https://taginfo.geofabrik.de/europe:britain-and-ireland/keys/building#values .

For example, for semidetached_house100752, a regular worldwide overpass query https://overpass-turbo.eu/s/22pe will work - you can zoom in and review the data and, if a simple "replace the value with something else" makes sense (as it does here) you can use that same query for input to Josm.
