Insure Spanish Registered Car not in my name?

Hello All

I have bought a Spanish reg car in the UK.

Its currently in the UK.

I have the papers but not a copy of the guys passport or NIE.

The car has a UK mot but its Spanish ITV has run out

Do all Spanish car insurers start to get funny if you don't prove you have got the car in your name after a certain time?

Some people say they have been driving cars in other peoples names for years and its no problem. Some people say their insurance gets arsey.

Whats the consensus here?