There are quite a few federations in the UK, which will host meets all around the country. I’m in the Greater London division of the GBPF, so I only know about ones in the south east. Here are the feds I know about:
GPCGB (can’t find a website for them!)
This isn’t an exhaustive list – I’m sure there are more!
All the federations will have differing rules on whether they’re raw/multi-ply, tested or untested etc.