After my gearbox failed and I got ripped off trying to get a used one from a breakers to replace it, I decided to get the current gearbox reconditioned.
I managed to get hold of the firm that supplies the kits that reconditioners use and asked them if they could recommend anyone fairly local. They gave me the name of S & D Transmissions in Doncaster. I discussed it with S & D over the phone for nearly an hour (!) after which I decided they knew what they were talking about. It cost £1400 for a full recon. This was done about a year ago and it works perfectly. Hope this might help somebody with the same dilemna.