Benvenuto Alvaro!
There are a number of people who have contributed to this thread who have had dealings with your grandfather and which includes Nigel Osborn and Uncle Ian both of whom flew for him in times past.
We also had a visit by Anthony Tuson (Ant T), son of Mike Tuson, who similarly flew for Denis. TRC did some work on your grandfather's JetRanger at his hunting lodge in Scotland at one point and there are doubtless others who have yet to contribute.