They must have tightened things up in the last 10 years or so. The amount of untaxed, uninsured and un MOT'd ( ITV in Spain ) expat cars running around the less populated rural areas was a joke ( ourselves included in UK registered RHD cars ) Only when we bought a Spanish plated car did we stick to the rules. The MOT ( ITV ) stations were like a rolling rd come production line, you stayed in the car and drove it down an inspection line past various mechanics performing various tests, tractors in front, artic units behind for eg, really easy. IIRC trailers also needed an ITV test.