Mine doesn't renew for a while. But last year they tried to put mine up £100 as I change4d from a Fiesta ST to the GTi. Called them up, the helpful woman put my details through as a new quote, said it would be £50 cheaper. So technically saved myself £150 for a quick 10 min phone call. Always check comparison website and get them to price match or leave
Also, best quotes usually come in around 28 day before renewal. I did that last year and checked again a couple of weeks later. It certainly does go up!