how come? (1) jam

When on holiday in the Dordogne we noticed that several supermarkets had an English section selling a range of products and I was surprised to find a whole range of Tiptree jams / conserves alongside the HP Sauce and Marmite. My wife has pointed out that our local Tesco store at Gt Notley only stocks Tiptree strawberry jam and our favourite victoria plum along with the rest of the range is not available (they produce 37 different types). Trivial I know but how come our supermarket is incapable of supplying locally sourced jam that we can get at supermarkets in France!