I use pet plan as lots of people recommended it to me, they cover for life should your dog require constant medication later in life, only, if you start a policy while the dog is young, i.e. They won't offer this on a 3 year old dog for example or if you leave and rejoin.
That is important to remember.
My friend claims medication that costs over £50 every single month on a policy that costs half that, so for his situation it's win win financially.
I own a springer spaniel and took out this life cover as a pup and started off paying just over £20 p/m and now it's touching £25 p/m and I have never claimed at all, it's just peace of mind really to have it in place.
The price you are quoted does sound high, but given the health problems particularly with skin infections etc on this breed this is reflected on price sadly.
You could always put money aside and save it just in case, but personally for me I like the feeling knowing I am covered on just about everything.
I am not associated at all with any insurance by the way, I just wanted the best policy possible for my pooch, after a horrendous couple of years back and forth to the vets with my last springer, I wanted a good policy, and I can guarantee that every vet you speak to, rates petplan extremely high and recommends them.
Hope this helps and good luck.