The Little Woodford Cafe does a nice line in sandwiches. They often have a Sandwich Of The Week which adds variety. Here I'm just noting down some good ones they've done, for the purposes of sandwich-filling-inspiration:
Salmon, freshly-poached, with cucumber and a homemade tartare sauce
Tuna fiorentina (with boiled egg and spinach)
Christmas special (turkey, sausage, cranberry sauce, stuffing - oh my)