I found a little bit of paperwork with the car, although most of the history, if it ever existed, is gone. I have the owner's manual, a Direct Line Rescue letter from 2001 and a handwritten receipt from Southern Garages who appear to have sold the car new, from 1991 for a belt, which is probably the one which is still in its packaging in the boot to this day.
The V5 came through and confirmed I am the second owner from new, so the previous chap owned it from new in 1991 until earlier this year, quite remarkable. He covered just over 47,000 miles in that time and appears to have looked after the car well. I know it was a 'he' because his name and address are on the letter - I googled it and found one result from a deceased estates public notification, sadly he passed away in July this year. Although I guessed before that this was probably why it was up for sale, it was quite sad to read the public record and see confirmation - for some reason I feel particularly responsible now for making sure this little car is preserved for future owners. It definitely deserves to be kept going.