Today I went to my local “Ajunament de Barcelona” office, the one for the “Districte de l’Eixample” to get my “Empadronamiento”.
It is a paper which says that I live where I live, which I need to register my motorcycle here. The motorcycle is still registered in the UK.
For this paper you’ll need (well, I did):
* passport / id card
* NIE paper
* rental agreement
* some current gas/water/electricity/rent bill
After a bit of queueing - going back home to get a bill - more queueing, the whole thing went smooth and I advance to the next level of motorcylcle ownership in spain.