My brother-in-law has a Minor 1000 (originally bought new by his father) but when he inherited it the only key was an unmarked one, and well worn at that. I have tried my collection of ancient keys and it is definitely a FS series. I even had a key that would work the ignition and passenger door locks but not those of the drivers door or boot.
Are FS keys still readily available?
I don't know how easy taking the ignition barrel out would be but presume the boot lock would be an easier proposition. Would that be the case and, more importantly, would the barrel be removable and would the key number be stamped thereon?