Casino at the Empire
The Casino at the Empire is the home of the WSOPE (World Series of Poker Europe) which runs in late September. Apart from the two week period when that is being held, the Casino at the Empire is a nice central location to get your poker fix.
You do not need to become a member of the casino to play, so feel free to just turn up and buy in. Tournaments start from £20 up, with any tournament of a £100+ buy-in being dealer dealt. Cash games are available, and very loose, for those who would prefer to steal cash from tourists or the locals from nearby Chinatown.
The casino has a 24/7 license so you can play whenever you like!