Hi Ron.... Interestingly, my Uncle Keith's BSA C15,which I acquired and sorted out for him, had exactly the same "two digits transposed" problem with frame /logbook numbers. It also was a NI bike so maybe they had some dyslexic staff? Fortunately DVLA accepted a letter ,pictures and a frame number rubbing but this was about 15 years ago and its obvious they have tightened up since then. Keep up the good work! Andy