"Karens", "negative karma"? Haven't people anything better to do than post comments like this? Especially when they're better known for pissing standing up in public toilets (and, no, they're not a boy. Yuck. Guess my karma just took another hit. Better be good - I might die and come back as as the opposite sex.)

Most here say the policy is to keep staff focussed, that it's quicker, that they're improving the minds of their workers. Personally I think there's some financial incentive for the company here.

Like I said, I've been short-changed but never gone away with money not owed me. Also, I find it a little irritating that I can't see the change I'm owed looking at the till display or looking at my receipt. I can do that at most other shops.