Um, what I really came here to say is that for a number of years now we've been getting our fish from
The Cornish Fishmonger. They're currently doing free nationwide delivery. I ordered about an hour ago and managed to get a delivery slot on 6 May.
I can personally recommend their smoked salmon (special treat once in a while, but they say can't be home frozen) and their fish is really good. While they are expensive, they haven't upped their prices like some places seem to have just to make a quick buck. Their prices do vary over the seasons - depends on availability of fish.
Delivery is in boxes with those frozen plastic packet things in them to keep stuff cool. You can choose how you want your fish (whole or filleted or sometimes more choice).
Disadvantage is some fish you have to buy a whole fish, rather than just a portion. eg plaice is a portion a fish. So is farmed sea bass. But brill (which we really like but which is expensive

) you have to buy a whole fish, which is 4 portions. OH will split into 2 lots of 2 before it goes in freezer.
They do various fish pie mixes too, and some sauces for fish as well, but we haven't tried them. I imagine they'd be good though, if the quality of their fish is anything to go by.
Sorry for sounding like an advertisement!
I also discovered that currently amazon seems a reasonable place to get some spices etc. Today bought pomegranate molasses and rose harissa for a roast cauliflower recipe. Plus some black garlic, which we first tried last summer and really loved, so thought would pick some up now ready for this summer. Watch the prices though, some are dearer than others!