DH and I called through on our way off on holiday (UK, self catering) and bought a caesar salad, curry and taco meal from chiller section and that was pretty much food sorted for the week! Do be careful in the meat section - they do sell US pork, so make sure you look for UK meat. Other meat is really good quality and the on the bone chicken pieces, either thighs, wings or drumsticks are really good value.
Bin bags, hoummus, falafels, cheese (there is an aged dutch cheese which is great). The riverway pork sausages are a very high meat content.
Trays of peaches and nectarines and boxes of strawberries over the summer have been lush - taste like fruit should taste.
We usually treat DMum to their boxes of 6 x tiramisu and millionaires shortbread desserts.
Frozen fish/seafood is very good.
I try and avoid the bakery section because thier danish pastries and croissants are so good......
Washing liquid, foil, cling film.
Large jars of olives and sliced chillis.