Meant to post a while back.
About a month ago I went to that relatively new place on the corner of Castle Street and Water Street, Santa Maluco.
It's basically a pizzeria and bar.
The pizzas ranged from about £12-£18 and all looked pretty decent.
Or they do this deal where you can pay £10, and can have as few, or as many pizza slices as you want.
They have a table system like meet brazil etc. where you have a coloured disc on your table. spin it to green if you want a slice, red if you don't etc.
They walk around every five minutes or so with different flavours of pizza, and you can have as many slices as your want(one at a time obviously)
Some nice bottles beers as well, usually about £4 a pop.
Highly recommended if you just want to have a beer and graze, eat as little or as much as you want.