hoses, belts, bushings, seal kits
Wheel bearing kits with gaskets, water pump, air filters, fuel filters, maybe some of those swivel ball grease packs, Maybe the dash surround and the dash cowl (or metal versions), because they crack. Drain and fill plugs, copper washers, wading plugs, brass rad plug, maybe hinge hardware if yours is rusty, door cards, door repair kits for rusty doors, Then you get to anything you might want down the line that's made by a UK manufacturer.
Honestly up to you. You can totally get by with spare rubbers, filters, a few bearings, and belts.