I thought it was a decent deal. Wager your £12 on what should be a certain outcome (Chelsea v Apoel Nicosia - Chelsea win), withdraw and then wait for your £30 cashback. They also have a 100% Deposit bonus up to 100EUR, although the clearing conditions don't really make it that worth it (unless you win of course.)
4. After the deposit amount has been turned over 5 times, your account will be credited with a bonus amount matching your first deposit.
5. The Bonus amount awarded is 100% of the first deposit with the maximum bonus value of 100 or equivalent in other currencies.
Obviously go via Quidco :)