Pay £6 for £18 worth of scratchcards for lottoland. You need to go onto the Groupon website and pay for the voucher. The URL then take you to lottolands website where you join or use an account if you already have one and enter the Groupon code. (Don't create a new account if you already have one. I think you will struggle to get your money back if that's the case) Once done select my activity and then select scratchcards tab and all the scratchcards you have bought will be there. Just click to play. It works fine using a smart phone.
I also have a 5% code for Groupon so only paid £4 and I won back £11. Not bad for 5 minutes work. Just be careful not to click buy more scratchcard. You can withdraw the full amount of your winnings so don't worry about having to withdraw to the nearest £10.
Good luck :)