Don’t bother!
So I downloaded their app and got to the check out and ordered over £25 of food (the minimum order) and no discount was applied so I phoned them up on 01608 811540 and the person I spoke to (a young woman) seemed clueless and first of all said something about 10% and I said “no the website states 20%) and then even agreed with me it was misleading. They repressive did not even attempt to rectify this - or appear to even care enough to. Lousy customer service so I told them to forget it!