The method of claiming a free bet will depend on the betting offer that you are looking at. That’s something important to watch out for - it’s common to see a free bet expire after seven days of hitting your account. Free bets UK usually expire quickly after being credited.
So if, for example, you receive a £10 free bet, the stake can’t be split into smaller chunks for different bets - if you were to apply a £10 free bet to a bet with a stake of £5, you would forfeit the remaining £5. When you are credited with a free bet bonus, it will typically have to be used on one wager. Free bets are a reward for either signing-up to a betting site or as a reward for a promotion they site is running.