Here's the fascinating answer I got from the owner:
"Hi Ian,
Damn! I didn't know there was a club for vintage Minors. I thought there was only the Morris Register; but that would explain why the Register has so few Minor spares. I'm surprised the spares secretary did not tell me about the Vintage Minor Club though.
I'm too embarrassed to tell you the chassis number, as I sold the reg on this one to recoup my losses after disaster struck (it was GW 1193).
But here it is so you can keep club records up to date
chassis number 11683
engine number 12145
I really wanted to get it on the road and use it but i could not find bell-housings anywhere, nor complete engine and box.
Ebay vultures are already nibbling at its no reserve auction

so it's too late now to find the parts through your club and put it on the road myself.
But I'm sure someone somewhere will rescue it and get it back on the road for the summer.
All the best,
Colin"
This raises all sorts of potential topics, but first of all, can anyone advise how he can back out of this sale and keep the car?