Yes, provided it is not linked gaming. The Gambling Act 2005 says that a single game of poker cannot be played across a number of different premises. the amount of the prize is determined by the number of people playing in different games of poker in different clubs or pubs.

Age restrictions\n\n Gambling ages in the United Kingdom are set out in the Gambling Act 2005: Part 4, Protection of children and young persons. It is illegal to permit any person under the age of 18 to enter a licensed gambling premises. The only exception is licensed family entertainment centres.