No problem - contact any broker on the coast.
In terms of insurers I would recommend
No. 1 - Zurich
No.2 - Liberty Seguros
Liberty will insure anything whether on UK or ES plates - LHD or RHD etc
Zurich I think will not insure UK plates but will insure RHD on ES plates.
My dislike of Liberty is their claims handling and Zurich is much better and more responsive.
I have policies with both but will switch RHD ES plated car over to Zurich on renewal.
Zurich policy is also much more comprehensive.