I don't think it's been mentioned but it appears FCO Rome has become a whole lot easier for back to backs. The new part has opened up and yesterday BA flights were at E16 (LGW) & E18 (LHR). I was flying to LGW, not on a b2b, but at these gates it's just like AMS gates - come off the aircraft into the departure area where the waiting passengers are.
Might need a few more anecdotes to confirm BA regularly uses these new gates rather than the satellite gates.