Have you ever heard about prize games? According to Wikipedia, prize games differ from regular by the form of winnings. Rather than winning cash prizes as per normal game, at prize games winners earn points. These can be redeemed in a dedicated shop near to or within the gaming establishment's area, although some games reward players with free games or tokens. According to the UK legislation, prize games are allowed without licensing. Hence, they are more preferable for organizers, however, they need to meet criteria clearly - not to be accused of organizing illegal activities.
Consider the example of bingo. According to Gambling Commission's classification, the following public places
can run prize bingo games without having operating license: adult gaming centers, family entertainment centers, unlicensed family entertainment centers and travelling fairs. Bingo game can be classified as "prize"-based if:
the maximum stake of £1 and a prize worth no more than £70 - per game;
there are no more than £500 of prizes per game;
there is no more than £500 in stakes per game.
Another legal category of prize competition is "free draw". It is similar to prize gaming, however, has a distinguishing feature - a price for entry. Two types of free draws are determined, hence: where all entries are free or - where there are both paid and free entry route. Again, these gaming should be organized carefully in order not to take the form of illegal lottery.
See the following resources to get known about prize gaming more:
https://en.wikipedia.org/wiki/Prize_Bingo
https://bingo77uk.com/news/prize-bingo