Have you tried Adelaide Insurance or if they are no cheaper, do an IAM or ROSPA course to get your premium down, (cheaper than changing your postcode).
http://www.adelaideinsurance.com/
If you do the BikeSafe day course (I did the one at Ace Cafe) you get a whopping 10% off BMW Insurance........the same as if I did RoSPA or IAM !
Not bad for £30 and the chance to see bike coppers in a very different light........quite human after all


Ok, so it's an 08 GS as opposed to GSA but they're not THAT unreliable surely???