Personally I’d stay away from those ugly, stupid UK wall sockets and plugs.
Use USA plugs and sockets, it’s ok to do as long as your wall sockets are protected properly and I guess the UK being what it is you would need the installation properly certified for insurance but you will save a fortune in cables.
15 amp USA = 7 amp UK or 20 amp USA = 10 amp UK. (240V)
These are continuous current ratings. I run a 3KW power conditioner fused at 12.5 amps off a 20 amp USA cable. UK max is 13 amps so no real difference.
Don’t go down the EU Schuko road.
Wall sockets to choose include Oyaide, Furutech, SR Purple, QSA etc.