The answer to this question is a little more complicated than a simple yes or no. In the UK, online poker is technically legal, but there are still a number of restrictions that must be followed in order to play.
Players in the UK are limited to playing with £5/$10 maximum bets and must be over 18 years old. There is also a requirement that players reside in the UK, meaning that many players from abroad are not able to take part.
Despite these limitations, online poker is still widely available in the UK and has been for years. There have been no major crackdowns on online poker operators in the UK recently, which suggests that authorities see it as a relatively safe pastime.
