To get to Norway is easy enough, only Holland, Germany and Denmark to travel through..... two ferries on that one....
However, if I get the EE2E done, that will involve, Norway, Finland, Sweden, Denmark, Germany, Belgium, France and of course Spain.....
I have done a quick Foreign Office check and can see no issues, particularly as there are no hard borders, with the possible exception of Denmark to Norway when my on line vaccination record should be sufficient.
If I was going from Germany or to Germany from the UK directly, not riding, there may be a form I would need, but only if I had not had all my jabs etc.....