i know they do in the US but im not sure if we do here, ive never been arrested and im just curious.
Bail is the practice of releasing a person either from police custody or whilst they're going through the courts, not the sum (the bail bond) which is taken.
Anyway, bail in the UK is almost always on a person's "own recognisance", often with conditions attached. That means no money is involved. Bail will be granted automatically unless there's some reason not to give it - ie, the person might run off. If that's the case, then they'll be remanded in custody.
In the US, there is a developed system of bail bondsmen, who will essentially pay bail and guarantee that the person shows up. If they don't, the bondsman can hire bounty hunters to seek them out, thus retaining their bond from the court.
Also then is the bail refunded?
Yes. That's the point: you give over a sum that the court thinks you won't want to lose as a guarantee you'll come back.
Sometimes money or a 'sureity' can be requested from the defendant or a guarentor on behalf of the defendant in return for release on bail for serious cases. However in the UK it is very rare this happens.