I think the number one thing to rate a fish & chip shop on is the quality of the fish and chips, if they can't get that right there's not much point in investing their time and energy into anything else! As it was the fish was pretty good, and chips not so much - they were kind of rubbery although to be fair still better than the really greasy ones at many chip shops!
Other things I liked:
Ice water on tap
They serve beer
They also serve unusual soft drinks, I forget the brand
Not that expensive
Portions weren't silly enormous
They have a 5 star good hygiene rating
Things I didn't like:
Tiny cramped tables
Cash only (realistically can they survive these days as cash only? I had to walk a street away to get cash and almost went to McDonald's instead until I remembered how terrible it is!)
Having to pay extra for ketchup read more