There are many other policies about but please make sure that they cover for lifelong conditions not just for 12 months!!
Petplan is expensive But they settle up very quickly and I have never had them quibble over a claim unlike the kennel club (long story) and Petplan do not appear to hike their yearly/monthly premiums much either unlike some other companies (ie kennel club!)...please note: the kennel club have been good as they have paid up over 10,000 pounds on my boxer who is just 4 years old but I would never use them again and have gone to petplan with Freya...
I think other companies you could look at are Argos, Sainsburys and Marks and Spencer...but I havent used them...Im sure others will pop along and help you out with their experiences...
My motto is buy the best you can afford...