Hi Chris,
The other Chris is quite correct with the number that we have on record! You do not mention if you have any paperwork to support the number you have, it does not appear to be an age related one suggesting that it has never been re registered. Is it possible that the number you have did not originate on the bike!!?
I suggest you contact the Club registrar Len Boydell and outline your problem, he may be able to throw some light, in any case, if necessary he can organise registering the bike with an age related number.
Len's email is douglasregistrar@talktalk.net
Cheers
Dave L