Thanks for the replies.
I'll be camping, with the occasional youth hostel stay to get some washing done. I have to do this on a very small budget, and have the idea that I can stealth camp in the dunes on many nights.
In Scotland, the plan is to come straight south to Edinburgh, because I have relatives on Speyside who'll put me up. I'll miss out the Aberdeenshire coast but will do the East Coast on the way south from Edinburgh. I'll watch out for midges!
I'm very tempted to take the trike, because it is then impossible to jump on a plane or train and come home early. I want to do a maximum of 2,400 miles, and this route is easily adjustable by taking different ferries out of Denmark.
The ferry from Bergen to Scotland only runs once a week, so if I miss it, I'm stuffed.