Hi, Marks and Spencers' insurance covers my Border Collie (aged 2 and a bit) for �10.64/month. They initially quoted me �9.90 with a �50 excess, but they give you the option of a no excess policy for which you pay a tiny bit more a month.
I have had no problems with them, although I haven't yet claimed. However, I would much rather pay a small monthly fee than find upwards of �2000 if anything was ever to happen to Jack.
They cover up to �7000 vets fees, but also other "extras" that some companies don't, like �200 behaviourists' fees, �300 special diet costs, and rewards and advertising costs if your dog goes missing.
I think it is more than worth it; Jack's welfare is SO important to me, and I'd rather pay a little a month even if nothing ever happens, just in case. Nothing else I have is insured, Jack is my baby so...!
Good luck, hope you find a good one. (Not sure if Bedlingtons are expensive to insure everywhere, but that seems an awful lot of money!)
Lisa.