René, I wish you all the best with German customs.
My SIL went through a horrendous nightmare last week. Unfortunately at my instigation, I didn't know what a debacle I would cause, I had meant well.
My SIL and our daughter are looking for nice sounding speakers. Now I learned from the British Pinkfishmedia hi-fi forum that Stirling Broadcast is closing the company for reasons of age. The remaining speakers will be sold for about half the money. As I have been a very happy user of a BBC Stirling Broadcast LS3/6 for eight years I suggested this deal to my SIL. No sooner said than done. The speakers arrived in Cologne a week ago. With invoice, customs documents, German operating instructions (you can't do without them). But.....now the speakers are being inspected by the “German Federal Network Agency”. I didn't know that recently even electrically passive devices need a CE seal which the speakers do not have. Even the RoHS papers were included. But it's not enough. Today my SIL gets the final notification from the Federal Network Agency, but there is a 95% chance that the speakers will have to be returned or destroyed (although the very same came to Germany regularly via a German importer until Brexit).

I hope things go more smoothly with your electrics for the indicators from the UK.
I think we are living in the Middle Ages with the authorities as highwaymen.

'14 4/4 graphite grey