I was in London last week and played at a brand new place called the Casino at Empire.
http://www.thecasinolsq.com/pages/index.html
You had to be a member but I signed up using my NY Driver's License in about 90 seconds.
Played some Roulette and then checked out the poker room. They have these odd round tables but had a 1-2 Pound game running as well as the latter stages of a tournament.
Looks like they are also doing some promotional stuff with the WSOP.
In addition, FWIW, I also played in Dublin at the Fitzwilliam card club. More like a trypical club than a casino but cool nonetheless.