This might sound fluky but I'm sure I owned that car around 1988/90. It is the same spec/colour and as soon as I saw the number plate my stomach turned. I will have to see if I have any old photographs to confirm the reg. "860" does sound very,very familiar to me. The rest of the plate is definitely the same.
I bought it off a chap who had just retired and was giving up driving. This was in Slough. Other than a bit of light rust around the OSF indicator, the car was in lovely condition. I did my courting in it and showing my (now) wife the pictures, well lets just say it brought back happy memories.
The worst case would be that both the cars originally came from the same dealer who issued a series of consecutive numbers. Anyway, lovely car and if my circumstances were different, budget wise, I'd snap it up straight away.