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Go to your local supermarket and check the fish counter. I regularly buy whole (good sized) bass for £2 each. Or bream for £4. Salmon is nearly always on offer too and cut to order. Mackerel is always super cheap too; plenty of good stuff available and its all very easy to prepare and cook. Most fish is good enough to need very little ponsing about with. However a decent Chablis or Sancerre always helps it go down nicely.
Hang on, you live in Cornwall,on the coast and you buy your fish from a bloody supermarket.
The stuff I mostly buy (not the salmon!) is caught locally (or I won't buy it). It's harder to buy from a fishmongers than you'd think but when I get the chance, I do buy from them; still usually landed in Plymouth though although sometimes Newlyn but local stocks have been very low recently.
I used to do veg stuff too - you'd think it's easy to buy from a farm? Nope, almost all of it goes up to Evesham's packhouses then comes back down again to the supermarkets and wholesalers! So our veg is from a veg box scheme from local farms.
We do try as hard as we practically can but it doesn't always work.
The best fish that I ever tasted was line-caught Chinook Salmon in Victoria BC back in the 1970's.
I find Morrisons supermarket fresh fish to be of good quality and recommend their Haddock.