My preferences to accompany fish and chips are mushy peas, salt, malt vinegar and an English style pale ale (not too hoppy like North American brews). I have never tried curry sauce or gravy both sound wrong to me. That said, in Newfoundland the dish is cod and chips with dressing (like stuffing for fowl) and gravy. When I was in St. Johns I had the cod and chips which were brilliant but passed on the dressing and gravy.
I'm a traditionalist when it comes to chippy. Peas, salt and vinegar, chips, fish. Maybe bread if I can be arsed to butter it. Gravy with fish seems odd. Gravy and chips, yeah, all day. But not fish, not for me. Ditto curry.
To me it's like saying I'll have ketchup on a Sunday Roast, or salad cream on anything that exists ever.