Errrm, I'm surprised at you not knowing this Anorak!
There's very few keys for all British classics of a certain age. Haven't you ever seen the guys selling original equipment keys off a board at shows? They have an orange and black board of about A3 size with rows of keys on it and that is every different key for Minis, MGs, Triumphs, Land Rovers etc. You used to just front up at the Rover dealer and ask for a key by the number, they had all the keys in stock all the time because there weren't many and gave them to anyone. I think there's around 100 altogether but they are very similar to each other and once a lock or a key is a little worn you can open them with pretty much any key from the same group, also they weren't all used on all cars so the Miini probably only used a couple of groups from the list. I replaced the barrels on my Mini when I got it because it had three different locks, none of which would open with each others keys. I changed them all out so that I had a single key for all the doors and then found that all three of the original keys would then open the new locks as well, even though they wouldn't open each other.
The key number shouldn't be on the barrel though, at least not on the outside section.
Edited by Dan, 17 June 2007 - 10:26 PM.