Deposit and play with £1. Not tried it myself yet. Not limited to BACS payable. http://www.topcashback.co.uk/big-fat-lottos/
Cheers Litefoot, although subsequent to my separate post about this I noticed a flaw: 1) to earn the cashback you need to stay a member for a week. 2) If I sign up today, my "subscription will renew on 2nd May 2016 at £11.90 per week for 110 entries" Given that this is within the week, I'll still be "up", but only by a few pence (albeit I'll have got a few free lottery entires. Not really worth it in my book, particularly given the potential hassle over i) cancelling my membership and ii) actually getting the cashback.