i was with adrian flux 2 years ago and sky insurance last year, they were both way to expensive this year so i went with "A Plan" they were 25% cheaper than sky insurance.
it pays to shop around a bit, most of these companys seem to think that you will just keep renewing with them regardless of the premium. they all seem to be competitive when it comes to getting the business but then put the premium for the renewal.
when i tried to talk to sky insurance about their renewal premium i just got a load of waffle about inflation.