Silver blanket (like in a first aid kit) to stop the cold seeping up, you lay it under your air mattress,
Snugly blanket each, pillow, sleeping bags
Clothes, pj's, wash bags and towels,
Wellies / crocs
Camping chairs, table to cook on, head torch, lamps
Burner or camp stove, kettle, pan, frying pan
Washing up bowl, sponge, washing up liquid, 2 tea towels
Cutlery, plastic plates, mugs, glasses
Water carrier (or large bottle of wate which you can refill)
Bottle opener, can opener, sharp knife, small chopping board,
Cool box
EHU lead
Disposable BBQ, matches,
Colouring, card games, travel games, frisbee, ball, kite.
Make something in the slow cooker like a chilli and then plug it back in when you get set up. You only have to do some boil in the bag rice then which is easy.
I think that's a pretty good list of what's in our big storage boxes.