Booker used to own (or franchise) a lot of the smaller local supermarkets - Fine Fare, Londis, Budgens, Mace etc.
Of which there are zillions.
They are, amongst other things, a wholesale supplier for whom, in another life, I used to drive an artic.
Booker were bought up by Tesco in (I think) 2017.
Fun fact - they're the same Booker as the one responsible for the literary prize.
ETA - Does anyone remember Pink Shield Stamps - or is there something wrong with my memory?