This is an 'off-shoot' in every sense. Strickly J Class only -
It's an offshoot in the same sense that Concorde was then, lacking some of the speed alas. Let's be honest, high quality service to premium passengers IS what BA are about as it's their primary revenue driver. As for crewing, CityFlyer aren't getting near it , as Marlowe says, it's being crewed from Gatwick.
I'd dial Galley FM down a tad.