I insured my cat with Petplan. They will fight tooth and nail to not pay you. They will even have the nerve to then re-send your insurance documents with additional costs they add onto your policy for their inconvenience.
They will also add onto the 'Life Policy' a disclaimer which will avoid you being covered for anything to do with the illness you tried to claim for originally.
I would avoid completely. When i rang up to complain and cancel, she told me to 'take care' 5 times when saying goodbye.