I will put a pitch in for NatWest Private Insurance. When I spun the roadster on spilt diesel on a wet road and bent the chassis, they authorised the rebuild on a new chassis within three weeks, I had the spin the week before that Christmas, the estimated cost of repair was £33k plus £8k from the Highways agency to repair the crash barriers. They are by far the cheapest for both my cars and house and contents insurance. I am talking to them about doing yacht insurance which is an ongoing conversation. Needless to say I bank with them. I am told that Lloyds are also pretty good. The banks want insurance business so price accordingly.
Pete