Nah, we never shop there. Costs too much, the produce is terrible and the meat is revolting. The clothing is over priced for what you get and is pretty shoddy. They do have a reasonable line of ready meals, but who eats that crap? We'd rather pay less and cook than pay a premium to eat preservatives.
About the only reason to nip into an M&S is they usually have good coffee in the cafe and clean toilets.
It's another storm in a tea cup. A cashier tried the same thing in our local Co-op two years back. She was fired on the spot. If you take a job, get paid for the job, you do the job. All of it.