You are right probably just a log book now.
That one seems to have survived to 1989 at least. Would be nice to find it again but may just be a V5 in someones possession.
What is interesting though is that I had the V5 show the change of colour to Red/Blue/Yellow they returned as Multi Coloured in the Colour section. The vehicle had during my first 5 years of ownership been painted in a Vauxhall Colour Goodwood Metallic Green - this was shown as Green beforehand.
When I purchased the vehicle in 1973 it was painted in it's original colour a non metallic Battleship Grey. It looks as though someone has returned it to its original colour. When I had it sprayed in the Vauxhall Colour it was stripped of all its interior and it was fully re-painted including inside the engine bay.
I sold it to a friend in 1984 I think it was and bought it back about 2 years later. I did a substantial mechanical re-build in 1986/7 including changing it from the original Hydrolastic Suspension to the later (and earlier) Moulton Rubber Cone type.
It was a big task as I had to change the front subframe as they are different, you can't get the ride height high enough otherwise plus some other problems with the diameter of the long top mounting bolts. I had to replace the bell housing as the idler gear bearing had collapsed chewing the bearing housing. All the gears were damaged so it ended up with a new gearbox as well.
I ran out of money after fitting Hi-Lo adjusters all round & Spax adjustables. It need a decent respray that I could not afford so it just got hand painted this time in Red/White/ Black Hamerite bottom half. I was lucky enough to find a buyer who could see the potential for restoring the bodywork as there was no rot and mechanically it was A1.
I did a few checks on it during PNC training days as it was a memorable number, certainly in the early 1990's it was still registered to an owner who lived in Derby in some posh flats that had garages. There were a couple of small garages trading in the nearby old railway arches with quite a few restoring Minis, never saw my old motor though.
I did know of one Arch that had a stripped down Austin Cooper 970 S being restored - they were built for homologation purposes back in the 1964 era. Sadly it was crushed when the Arches Collapsed so was probably written off. This rare model now fetches daft money as does the 1071 version before the 1275 engine was the norm.