Ritaratbag wrote on Mar 28^th, 2014 at 7:40am:

As numerous posts have stated over many years on the Forum, there are many insurance companies that will take your money, and insure any vehicles here. If  people have a major accident, and try to claim, they will find out that the insurance is void. Also local ITV stations here are only willing to take your money! I think it's best to abide by the rules/law in the country you reside in, at least for peace of mind, and to stop it becoming a nasty and costly experience.

Rita in my case my MOT was done in the UK not Spain
My insurance is with a UK company and my vehicle is shown as being insured on the UK vehicle insurance register. I use the Gibraltar office as then I can get fully comprehensive cover for as long as I like in any European country, ie it is not limited to only 90 days in Spain as it would be if it was bought in the uk. My brother is an insurance broker, so this has been checked.
I cannot register the right hand pickup truck in Spain as their NEW regulations will not allow it. I am not resident here in Spain I live and pay taxes in the uk, but I do visit for prolonged stays in Spain and France and Bulgaria