I was just thinking about this situation with my renewal just around the corner...
I'm insured at the moment with a company - who's insurance I got from their website, which offers a 5% discount for buying on-line, and there is probably a new business discount in there somewhere too. I've checked on the site to get a rough idea what my renewal should be (or what a new policy would cost me if I were to take a whole new policy out with them).
If they send me my renewal, and it's more expensive than this on-line price, is it possible to cancel the renewal with them, and then buy a new policy from their site? They'd be sure to notice something when it comes to sending themselves my NCB proof, but can they actually stop you from doing this? Has anyone ever tried?