Go to A Plan Insurance, I've been with them 4 years and I pay £47 a month and that is fully comp + cover for waterfed pole equipment. I had a claim recently, a car crashed into the back of my Fiat Ducato 2.8jtd van, A pkan were brilliant, they gave me a replacement can fully fitted with a (pure freedom) waterfed pole system. I would highly recommend them.
Regards, Kev.