Insurance is a strange beast. When I was learning to drive, I started looking around for insurance policies on my Mum's car as a named driver. Most were coming out at around 2-3k, as a named driver on a Mk1 Focus 1.6 LX. Then by chance I stumbled across Co-op insurance who gave me a quote of 700 quid as a named driver. We of course jumped on it (and unlike Quinn, it stayed the same when I passed)! When renewal came up for this policy, I had passed my test and had been driving on my own for about 8 months or so, I was nearly 19 and my Mum had just bought a brand new Focus so I gave her a small sum of money to keep the old one. I then started looking around for insurance, and again, most comparison websites were giving me figures of 2-3k, then, by chance, my Dad got a quote with Admiral Multicar for both my Focus and my Mum's new Focus and it came out at 1500 quid, for both cars, fully comp, albeit with a slightly large excess. About a month after taking out this policy, I got a job as an IT Technician and it went down by 300 quid, so we've ended up going from 3000 quid for just me, third party on the Focus, to both me and my Mum's cars for 1200 quid. Before anyone asks, I
am down as the main driver on my car.
Definitely deal with individual sites rather than comparison ones. I've found that the comparison sites give absolutely horrible quotes. Just for info, I'm 19 years old (18 when we took the Admiral policy out), I live in far from a 'good' area for insurance in Witham, Essex and I passed my test in November 2009.
I hope this helps and good luck with finding a good quote

A bit of patience and luck and you'll find a decent one!