But what winds me up in the UK is how rarely i even have the option of eating sustainably. If i go to a fishmonger, or a decent-sized supermarket, sure. But in a small supermarket, or a pub or a fish and chip shop, it's always the standards: cod, haddock, skate, rock, plaice (and to be honest plaice is a pleasant surprise).

Of those, haddock is the only one that's really okay (scores 2-4): https://www.mcsuk.org/goodfishguide/search?name=Haddock

Cod is okay if it's from the far north, but most of the time you have no way of knowing (scores 1-5): https://www.mcsuk.org/goodfishguide/search?name=Cod%2C+Atlan...

Plaice is okay if it's from the east coast, but even then, the fishing methods are damaging (scores 2-5): https://www.mcsuk.org/goodfishguide/search?name=Plaice

Rock salmon is critically endangered (scores 5): https://www.mcsuk.org/goodfishguide/search?name=Spurdog%2C+S...

Skate is endangered and illegal to fish (scores 5): https://www.mcsuk.org/goodfishguide/search?name=Skate

Now, given that rock and skate are endangered, i have to admit i'm a bit confused about how they end up on menus. Are they being imported from other parts of the world where they're legal to fish? Or are they actually other, similar and legal, fish being sold under incorrect but familiar names?