> Also, I would be interested in a list of weird shop values, as you have done for other countries

https://wiki.openstreetmap.org/wiki/User:Mateusz_Konieczny/unusual_shop_values/United_Kingdom

note that "unusual/not documented" does not mean wrong - in some cases it needs to be rather documented at OSM Wiki as valid

also, create note if unclear, do not edit blindly or based on guess

often locating website (add adding it via website tag) is helpful