One update though:
I have had a further message from the late owners son, as to it's history.
So one owner plus demonstrator.Malcolm, I have found the Logbook and service record, and will post them on to you.
The early history of the car is now clearer from the documents.* It was first registered (presumably as a demonstrator) in February 1985; my father bought it three months later in May 1985.
Work has delayed the rear brake refurb, but that shouldn't take too long to do once I get round to them.
I will put it in for a test as previously mentioned, but it will fail due to drivers rear sill end.
It should give a good indicator as to what is needed to be done for the next owner.
This car was first registered on February 1st 1985 to ...........
On the Log Book:
Austin Rover Group LTD
Company Vehicle Control
PO Box 359
In the service book:
Austin Rover Group Ltd
Then Purchased by the First and only private owner from:
Charles Clark Stafford via Appleyard's of Wakefield.
(Likely a dealer exchange.)
The price for a 3 month old Montego 1.6L in 1985 was 5199.00 including Road Tax!.