On the Padron as a non-resident?
I've pinched this from another forum and is yet another reason not to be on the Padron unless you are resident.
" For British non residents who own or want to register ownership of a Spanish vehicle some regions insist a padrón is presented with the documentation. You should NOT be on the padrón if you are not a resident here. Being a non resident on the padrón equates to being a quasi resident in the eyes of the Spanish law and no British resident here is permitted to drive a UK-plated vehicle. We have had cases where the UK plated vehicles were impounded and huge fines imposed purely because they were on the padrón and driving their UK plated vehicle during their permitted 90 days here. Unfortunate for the local councils who receive funding from central government for every person on their padrón list but this needs to be pointed out because many are on the padrón as second home owners but not residents in Spain and drive over in their UK plated vehicles which could cause problems for them."