I honestly don't know what goes on amongst Corbyn's staff, but it appears that there was tension between Karie Murphy and Fletcher. Seumas Milne became a permanent member of staff in the New Year. Anneliese Midgley (Fletcher's deputy) had already resigned.
Meanwhile, it appears that Momentum is losing many of its new and young members. My DS, who's studying politics at uni, decided to go to a Momentum meeting to see what it was all about. His verdict was that it was full of bossy old men (his words), who shouted down the younger people. DD has a number of friends who were initially excited about Momentum, but seem to be disillusioned.
From an outsider's point of view, it seems that the Labour Party is tearing itself apart. I think there are some good people waiting in the wings and I hope the time will be right sooner rather than later for them to make a move.
Fitzy I don't think there's much wrong with a lurch to the left, although I think the traditional ideas of left vs right aren't relevant these days. Some of the press releases have been, quite honestly, ridiculous. As far as I can tell, Labour doesn't have coherent strategies. They're too wishy washy about things which aren't really important.