Tescos, I once got tipped a couple of smokes (not supposed to take any tips but i did anyway).
Wow, i got a quality street, a single, at christmas, passing a tin around on tills.
An old lady gave me a couple of murray mints because i packed her shopping for her.
Some guy tried to tip me £50 at christmas but if i got caught with the cash i'd get suspended so i didn't take it, though it was tempting, nice crispy £50 note, mmm.
Oh and the most useless of all 10% discount in tescos, which i never use as I don't live anywhere near it and I avoid buying in supermarkets, especially budget ones. I gave that to my mum, she doesn't mind shopping in tescos.