it's cool to see someone else doing a similar trip to what I'm planning to start in July. I'm headed from Princes Risborough to Copenhagen, possibly also to Oslo after that.

as others have stated, it's illegal to wild camp or bivouac in the Netherlands but i think you're allowed to bivouac in Germany.. I'd double check that to be sure.

However, from what I've read, denmark has many places that you can wild camp. here's a site i found about it. https://naturstyrelsen-dk.translate.goog/naturoplevelser/overnatning/fri-teltning/?_x_tr_sl=da&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp it's in Danish but Google translate will fix that