"As far as I understand it you don't have to have a spanish licence. You can keep your UK(it's an EU Licence anyway) licence if you prefer but it must be registered with the Spanish equivalent of the DVLA."

.....presumably this is at the Trafico in Taragona ??????


Also if you are on a UK licence you still need to have a medical certificate just as you do with the Spanish licences......

.....hmmm:   where do we go for this?      

It's a bit like   'did you know'   you need a Cedula de Habitadidad to be legal.  We all have one don't we?   Do we?