New users can get £15 free to spend on food at Mastercard
1) Download the app Qkr
2) In the friend referral area add the code NEUDUA7641
3) Go to the Rewards tab, and add the code QKR10BH1 (generic code, provided by Mastercard) to get £10 free credit
4) Redeem on any order over £16 - so you spend £1 to get £16 worth of food. Enjoy!