Yeah crocs and a poncho are useful if unstylish for a morning wander
Plastic bags to keep wet clothes in
Big decent plastic sheet/tarp so you can keep most of the van dry/clean when you’re wet and muddy
Newspaper – firstly read then insert into wet boots/shoes
Octopus (weird small roundish multi peg washing hanger)
Tin opener, quick heat easy cook meals, insulated mug
Pre researched Paper/local copy of all useful stuff like pubs, hotels, shops, fuel etc etc coz internet will be awol and you might fancy a warm meal/night in a hotel etc
*re internet, if you’re into tv etc do lots of downloads before you go
If you go nw try the crask inn, we liked it.