So I went along to one today, after asking if we'd be eligible. I was so nervous, not sure why as they were really nice.
You pay either £5 for a family or £3 (I think) for a single person, for this you can choose a number of things from the fridges, shelves and fruit and veg. There was also some cosmetics.
Anyway it was fine, so just posting to mention this to anyone as I hear there are many around the place.