Yeh they can be a nightmare. yes the renewal letter with no claims years listed is all the proof they require as far as I know. What I found strange was that Ive just bought a ford connect and to transfer my no claims to that I had to cancel my insurance with car first, so bit awkward for getting rid of the car. someone hopefully buying today, hope the 04 reg connect is reliable as the 03 reg nissan almera has been : )