G-CSNA was flown by my Dad in the early 80's from LBA. It was maintained by Northair, who are long gone i'm afraid. It was then sold and operated from BLK by Westair (I think) who I believe are still around...I think this would be around 88 or 89.
Previous to all of this it was Lord King's aircraft...
Not much help really but you could try the guys at Blackpool...
Good Luck