For all those who want to speculate - please go ahead if you have any ideas of what may have happened.
It doesn't do any harm at all to speculate on an internet rumour board as to what may have gone wrong. For the "ooooh mustn't speculate" brigade - stop being so pompous - it is only PPRuNe not the AAIB or a BoI.
It was a mid-air with a late-running Father Christmas.
Trouble is, there are enough idiots around who will read an uninformed speculative post on here regarding something that is rightly confidential and take it as gospel, repeating it endlessly and gathering credence due to volume as it goes.
Anyway, the initial signal is out with some of the facts for those who have access to it. Most important is that the crew got out and no-one else was hurt.