I've confirmed that this is Bucclegh Cottages is indeed part of the address, so the actual postal address is 1 Bucclegh Cottages, High Street and the numbering is then according to Bucclegh Cottage rather than High Street. The Wiki: https://wiki.openstreetmap.org/wiki/Addresses_in_the_United_Kingdom is asking to avoid addr:terrace so I used addr:substreet. What I didn't quite figure out is whether it's better to put the tag on the polygon or on the the node for each entrance. I've added in both places.