It's probably a bit late to try doctoring the chassis no as I have already sent th log book back to DVLA stating the different numbers (a week or so ago). I rang DVLA yesterday and the landrover hasn't yet flagged up any potential problem with them, but I guess it is early days yet. I have contacted the dealer and he appears to be worried about the implications to him. He has said to keep him up to date. Meanwhile it failed the MOT but only on silly little things like clips etc. I don't know whether to bother getting it fixed for the MOT - in case it gets impounded. I will try to get pictures uploaded on here, but I not very good at things like that. I am very grateful to you all for invaluable advice.