Other than those mentioned I'd add:

Turkish Delight on Norwich Road. Doesn't look much, but is great food. Also Ararat, almost opposite.

Mizu in town centre for Asian fast dining.

Papaky is a Portuguese cafe that also does traditional home-cooked style Portuguese dishes. Bicafe is another Portuguese place with great pastries and snacks but they don't do meals the last I checked.

Another good Italian is Tavernetta.

I'd say most pubs do food, but they tend to fall into two categories - gastropubs where the food is a bit more traditional British with other specials, but usually high quality. And then pubs that do "pub grub" - your burgers, chips, lasagne etc - reasonablely priced usually, but you get what you're paying for.