I used AUA:
http://www.aua-insurance.com/photographer-insurance.shtmAlways a very prompt service. I had insurance with them for two years but have since let it lapse. In that time I added and amended the policy a fair bit as I bought or sold lenses etc. Would usually get a reply within 24 hours with a revised quote and any difference to pay etc.
For £4500-5000 of equipment the policy cost around £170 I think. This covered all the kit from theft AND accidental damage, also had something like either £1 or 5 million public liability cover, as well as trips out of the UK up to 90 days. Excess was I think either £50 or £75.
I do feel a little "exposed" now I don't have insurance. When I had it I was more than happy to take my kit to work, to the beach, out at night etc. But currently it's a concern in my mind that if anything did happen, I'll never be able to replace the equipment. If/when we go travelling this summer I'll likely take out insurance again, though I might look into home insurance options that could cover it.