You're so right icod - The most awful shop where they are overly-concerned about whether or not you deserve a carrier bag.
And yes, full of cloned Mrs. Slocombes who look very disapproving at you when they see that you already have an M & S carrier bag with room left to squeeze another item in. They're more interested in tut-tutting when you say, actually, yes, you would like a Debenhams carrier bag for the toaster you've just given them £50 for.
And lots more disapproval when you politely decline to take out a Debenhams card.
All in all this shop is staffed by disapproving old bags who don't mind in the slightest about discussing trivia with their fellow shop "assistants" whilst you wait in a very long queue, to eventually be told,
"this lady's returning something and it may take some time - perhaps you'd like to go to the only other staffed till on the other side of the shop..... er.... and I hope you don't expect to get a carrier bag."
It's a fucking awful shop staffed by truly awful people.