What is the convention on sacking front bench? / Corbyn strong leader

This is another go at getting some info.

While ago story in both Observer and Sunday Times that Hilary Benn would encourage other members of shadow cabinet to resign as he had lost confidence in Jeremy Corbyn. I think the story may have changed in later editions. In Exeter I get an early one. No way could a party leader allow this sort of story without a response. So I thought.

No surprise then that following a phone conversation when print version available, Benn resigns or is sacked or however you want to describe it.

"Benn sacked in the middle of the night" as some journalists remembered this when reporting the leadership challenge, the non "coup" etc.

With Boris at this time it is perfectly clear who the journalists are, where the info is coming from. (Sun , Telegraph ) some extras no clear source.

Benn has stated that the original stories did not come from him. Strange, some might say. What happened? Some one probably knows.

Main point obviously that Corbyn was strong enough to take action, whatever appeared to be the case as reported in newspapers.

But a bit of detail would be good to know. It becomes more clear that the Brexit disaster was caused in part by media priority for knocking Corbyn at a time when his style of support for Remain would have had a positive consequence.