A friend of mine has moved to Spain for the summer. He generously invited me to join him for a week and we were discussing his car. It's British registered and fully legal in England. He reckons that he can only keep it in Spain for three months and then must take it back to the UK for at least a weekend. He was tempted to pop into Gibraltar but wasn't sure whether that counted as taking it out of the country. However, another friend of mine recently did similar and he averred that if the car was legal in the UK, it was OK in Spain. Do you know which one is right?