I used Linea Directa, the same as Direct Line in the U.K., But a lot cheaper.
The good news was my premiums went down every year for the 5 years I was living there and using my English Citroen C5 Tourer, which I re-registered to Spanish plates.
When I returned to the U.K. and switched the registration to English the insurance companies in England would not recognise my 5 years in Spain so wiped out my maximum no claims bonus.
There is a saying, " Rip off Britain", Well it´s right.
Get directa Linea on the phone they will speak English if you ask.
You will find it difficult to beat the price.