Hi John
Don't rush into this. You should get 6 weeks free insurance with the Kennel Club so you have plenty of time to make up your mind.
PetPlan are considered by many to be one of the best, but they're also one of the dearest.
We have Buddy with Sainsburys insurance, which many people on COL recommended, and gave a reasonable level of cover for a reasonable price.
We've not had to claim yet, but their paperwork did come through nice and smoothly. You also get a discount for buying online and/or for paying using a Sainsburys credit card.
Cheers
Steve