A short, specific list for the foreshore rather than a full department.
Mudders mud flotation shoes strap over your boots and spread your weight on soft ooze — the difference between crossing a gutter and getting stuck in one. The Jack Pyke Super Hide Pole props netting where there is no natural cover to work with, and the David Nick 65cm leather-topped tripod stool gives you somewhere dry to sit through a flight without carrying a full seat stick.
Wildfowling asks more of the rest of your kit than any other shooting. Waders, a coat that will take spray for four hours in the dark, and a bag that keeps cartridges out of salt water matter more than anything on this page. Lead shot is prohibited for shooting over wetlands across the UK, and the detail of the regulations differs between England, Scotland, Wales and Northern Ireland — check the current position for where you shoot.
See also Wellington Boots, Waterproof Clothing, Cartridge Bags and Decoys.