Gambling in the UK is an absolutely legit thing. If you are 18+, you can try gambling in offline or online establishments. For example, many British players can go to the land-based casino and try real money gambling. Besides, there is always an option to try online gaming. This will allow you to try games without risking your own money if you have chosen a free or demo game mode.
Speaking about gambling, you should always be aware of the consequences because it is super easy to become addicted. This can ruin your life or the life of your relatives or friends. That's why such organizations like GamCare or BeGambleAware propose free support for everyone. You can contact these authorities via LIVE chat or give an open call by the given number on their websites. Be sure to contact them as soon as possible if you think that someone needs a real help. Don't try to solve this problem alone, and contact professionals!
BeGambleAware website - www.begambleaware.org
GamCare website - www.gamcare.org.uk
P.S. Be sure to check, if the online casinos have a seal of the BeGambleAware. This is mandatory for the legit gambling sites in the UK.