PetPlan have paid out £14,000 worth of claims for my Lurcher over the past 18 months. He has an exclusion for gastro issues, as he came to us as a rescue pup with campylobacter, so it was a pre-existing issue, but they still covered him when he developed medication induced pancreatitis and gastritis recently.
As iVampire said, you need a minimum of £7k a year cover. I’d say get the most you can afford - a week’s stay at a specialist veterinary hospital, with a couple of follow up visits almost wiped out a year’s cover for my boy last year. Definitely go for a lifetime cover policy, so all conditions are covered every year, rather than them excluding conditions on each renewal. For example, if your dog developed something like diabetes, they would continue to cover treatment for it for life, rather than excluding anything relating to diabetes at the next renewal day.
Also check what you are expected to do re the dog’s welfare, for example, some will only cover dental work if you have their teeth checked by a vet annually.
PetPlan are definitely not the cheapest, but I’ve never had them refuse a pay out yet, in over 30 years of having dogs and their customer care has always been great as well.