We insured our new trailer tent with Caravan Guard. Whilst in France we lost our trailer cover - no idea what happened to it. Ended up ringing Caravan Guard and they were really helpful and told us to buy what we need and sort it out when we got back.
Got a new cover and e-mailed for a claim form. A really nice lady rang my mobile to say they do it all over the phone and what had we spent. I was in the supmarket at the time and didn't have the exact figures to hand (as you don't in a supermarket!!!) - told her it was about £120 total to be reminded that the xs was £100 and did we want to continue with the claim? Decided not to bother for about £20, but was pleased with the service we received.
If you join the Pennine Owners Club, you get discounted insurance with Richard Keen. Although it's on a par with other companies (even after discount) the discount and club membership fee are used to subsidise the meets.