> someone told me about a fish-n-chip buffet in Arbroath, Scotland

if it’s the fish and chip shop (buffet is a different thing here), i’ve been there and they do a banging fish supper.

The Bellrock lunch buffet, £15 weekdays.

“3 courses including Soup, Pizzas, Haddock, Spicy Fish, White pudding, King Rib, Chefs dish of the day. Hot desserts with Custard, Cold desserts i.e trifle and cakes, Cold Meats, Pasta, Salad, Whippy Ice cream.”

https://www.thebellrock.co.uk/lunch-buffet

I think OP is referring to this https://www.thebellrock.co.uk/lunch-buffet which does appear to be a fish-n-chip buffet of sorts (amongst other things) which has been in various tabloid newspapers in the last month or so.