Gatwick:
Gatwick / BA have said that all BA flights will be using the South terminal by 25th January but some flights will be moving before that date:
BA2776 Gatwick to Jersey 23 November 2016 only
BA2273 To JFK (departs 17:05) From 11 January 2017 onwards
BA2272 11 Jan departure from JFK (arrives LGW 10:00 +1) and then arrivals from 12 January 2017 onwards
BA2612 Gatwick to Naples (departs 14:30) From 19 January 2017 onwards
BA2613 Naples to Gatwick (arrives 20:50) From 19 January 2017 onwards