Martin,
I am with CN and in the last 5 years have had a total loss of a car due to theft (£23,000) and wiped out the side of my C200 in a car park causing £3000 worth of damage (think that was one door mirror at Merc prices

), but with that against me i still only pay £140 a year for a 2 bike policy with Carole Nash.
I know with insurance companies it can be you got them on a bad day as policy proces changte a lot, but that seems really high to me so i would shop around. That is unless you live in downtown Tikrit or somewhere like that