I've just bought an 850, and like many of you on here I phoned A-Plan Insurance in Newbury.
Wow!!! The cheapest quote from the 12 that I tried, they saved me £70 from my next best price, and were friendly to boot.
The best bit was that they also saved me £125 on my Buildings and Contents Insurance, which isn't due until August. They helped me cancel my existing policy with Barclays and make a saving straight away!!