The Fish Society
No prizes for guessing what this one's about, although you might be surprised at the scope of this site. You can buy a comprehensive selection of fish, hampers, shellfish, smoked and tinned, as well as recipe kits for paella and thermidor. All the fish has been frozen as quickly as possible after catching, which, according to a Radio 4 experiment, doesn't detract from the quality or taste at all. If you order by 1pm it will come the following day.
Where 0800 279 3474; www.thefishsociety.co.uk