Some British products available here mainly in the Coop (2nd largest chain).
Manor have started stocking some Waitrose stuff (Riviera stores, Geneva through to Vevey) now, but not had a look to see whats there yet.
British butcher as well now in Vevey area (St-Legier) - makes his own sausages, pies, biltong etc, and also stocks a nice but limited variety of other UK foodstuff, (Yorkshire tea, custard creams etc) courtesy of Jim's.