At the moment I'm using Lancaster, a LR specialist insurer. When I had a look round the comparison sites such as Confused.com, they came out as one of the cheapest. My LR policy does not accrue NCB and my full NCB is used on the Mondeo.
For the last couple of years I have let my existing policy lapse and taken out a new policy with them as I have found that this is cheaper than the supposed best renewal price that they can offer me.
I couldn't tell you how good/bad they are in the event of a claim but then that's something that none of us ever really want to find out for ourselves.