... and the change in the position on Brexit was a factor. The choice between a Labour negotiated deal and remain made many people say "but we've already voted on that and decided we don't want to remain."

The leave with no deal option was a bit like the nuclear deterrent - neither side wanted it but remove it and you immediately remove your bargaining clout - if the EU Commission realised that remain was an option on a second referendum they would hardly be likely to offer any kind of acceptable deal.

What Corbyn did achieve was that he energised a lot of young people to take an interest in politics and the Labour Party had the biggest membership of any political party in Europe. Unfortunately with youth goes blind idealism -we were all there at one time weren't we after all? It also meant that the Momentum influence was mostly in favour of remain as opposed to the traditional heartlands.

I just hope that these young people won't sink back into apathy.

Maybe if Johnson gets Brexit done this won't be an issue to divide Labour any more and a slow recovery can take place:-

I don't agree with everything this man says but worth a listen:-

Jonathan Pie - Why Labour Lost.