We have petplan they are not the cheapest, but the cover is good and we have never had any problem with them... and yes we have made some hefty claims, also the people you speak to are always sympathetic and helpful
We're with Petplan too. Agree with Woofgang, not the cheapest but they've been superb with us (their people are lovely and very helpful), and we have had to make a few claims. One thing to look for is a company that will cover lONG TERM illnesses (eg diabetes). Some companies only cover for a certain amount of cash......others will cover the illness for the lifetime of your pet, which is important.