When did above the BA above wing handling go to GGS? I guess it was when they moved back to the North Terminal? When you say the BA staff "left the business", I am hoping you meant TUPED across to GGS?
I wonder if BA Engineering would have to bid to cover maintenance for their own fleet once more?
As for the new name for the LGW based short haul leisure operation, I am surprised that no one has suggested "British Airtours"..... LOL it's not really brand aligned for 2021 alas.