Roach,
I'm not sure about the relation in ATC.I think that the HS748 captain used to be on Concorde,but that could be a rumour as well.
On the last day of Concorde operation in 2003,one was out over the North Sea doing the same trip.It descended over Fraserburgh very quickly and dropped through Aberdeen airspace still working Scottish,en route to Edinburgh.I was on radar trying all I could to get it to do a farewell beatup,as it was over Kintore.The captain wouldn't bite unfortunately.That would have got the Evening Depress screaming that night.Oh dear,what a pity,never mind.
Ps I don't have a relation in BA at all.