That makes sense Dave. Even here, the different supermarkets/shops vary according to where they're situated. I was looking for cornflour to make cheese sauce. Asda (near the City) only had 'cheese sauce mix' (yuk) but Roys of Wroxham out on the Broads had several makes of cornflour (including dear old Brown and Poulson), as people are more traditional there.

Conversely, my husband likes to have many different (and hot) spices in his cupboard, but Roys of Wroxham only have one - 'curry powder'. However, in the City, there are numerous Asian shops selling all kinds of exotic stuff, and he happily goes there to browse to his heart's content.
I like the diversity. It's all very interesting.