ETOPS you quoted me:
sat on the deck in SSH....
Then issued the riposte:
Same for you Wycombe
Not sure I understand your response, it is quite obvious that the aircraft would return to the UK using the crew from the previous inbound - albeit they may have arrived up to 3 days earlier! (flight only operates outbound on days 1, 4 and 6).
Back to the original point I was making - which was that it sits "on the deck in SSH" for 6 hours (arr 0500, dep 1100 according to the BA timetable) - that cannot be efficient use of a high-value revenue-generating asset - even if it parked in SSH for nothing!