Heard that British Airways flight 054 (JNB-LHR), B744 (G-BNLF !?) either departed and returned or never departed due to a fuel leak at Johannesburg last night (10th) :

''I taxied past the aircraft at 23h30. It was parked on the Delta ramp surrounded by fire engines with a large fuel spill under the port engines. There looked like crew and pax on board.''

Estimated to depart JNB at 21:00 tonight (local time), just under 24 hours late.