Play in a room in Stanmore. Usually have a 50/1 cash table running that is quite weak. I don't play it often but have once after being KO'd from a tourney. Google River Card Club Stanmore if you're anywhere near there.
I've only been to one. It's the Ladbrokes casino close to Paddington Station. They normally run turbo tourneys with buy-ins ranging from 10 to 50 quid. But I believe cash games can be arranged by request also.