I'd assume the fire doors & shoplifters ?
But could be anything ?
Sainsbury's is my preferred super market. then maybe Tesco ?
Morrison's is pretty much - unwashed scum of the earth which makes an Asda look posh,
My local Waitrose has an lovely "drain" smell about it, go in your workwear & security follows you
I have a nice Heron's & also Heron's on the council estates...these along with farmfoods are brilliant.
Go in the store in suit & says please & thank to checkout person & they think you must be a mystery shopper or from snooping from head office !