Have you tried any of the proce comparison websites?
comparethemarket and confused are pretty good.
Insurance is a bit of a lottery, what might make you seem high risk to one company doesn't mean anything to the other! I'd run some quotes through some of the websites and then phone up the cheapest and haggle, you should be able to get at least 5% off without even trying, you've just got to keep asking!
I've just picked up my new Zed (58 GT), and sorted the insurance Fully Comp (including GF as driver) ..... £270 !!!! , I nearly snapped their hand off! it's about £100 cheaper than the Laguna! but saying that I also had some companies quoting £700. being old has it's advantages.