I use Wiatrose in Deptford on a regular basis and very seldom checked the receipt or even said yes if offered one but one day I kept and checked it and it stated a £10 cashback !! No way on earth would I just want £10 in me wallet. Went to customer services and got back the tenner within minutes. Funnily enough haven’t seen the assistant who served me since then … maybe she tried it on once too often 