Just had a look through all of the history, and the oldest thing I can find is that the 6000 mile service was stamped 6-4-2000 and is stamped at:
Vehicle Operations
Rover Group GaydonBanbury Road
Lighthorne
Warwick
CV35 0RG
Unfortunately I know nothing more than this
Interesting - it could have been owned by Rover by the looks of it.