Watson quits. Will Labour’s moderates follow his example – or endorse an extremist as Prime Minister?

Only yesterday, Andrew Gimson reported for this site that the party’s Deputy Leader was in deep trouble in his West Bromwich constituency.

WATCH: McDonnell insists reports of a split with Corbyn are “rubbish”

“Jeremy and I go back 40 years,” declares the Shadow Chancellor, denying that he has been “frozen out.”

Joel Charles: The hard left must not be allowed to win the ground war

A clear campaign narrative that balances local and national priorities is crucial. Engage with community groups. Select candidates early. Use social media to complement, not replace, campaigning.

Peter Franklin: Ruling political tribes 1) Labour. How the Left came in from the wilderness and drove the Blairites out.

Since I last surveyed the political landscape in 2013 and 2014, some ruling tribes have been cast down, and some formerly lost tribes have risen to rule.

Chris Grayling: It’s time that we unmasked Corbyn’s Labour

Of course the Government must sell its vision and achievements, but we must also expose the hard left’s anti-democratic conduct and duplicity over Brexit.

Richard Benyon: Water privatisation has been a triumph, and we need to say so

If we can win the argument for well-regulated, competitive provision of essential services in this sector, we can win it elsewhere.

Did Corbyn shield an ally from the consequences of harassment allegations?

Kelvin Hopkins’ belated suspension contrasts with the treatment of Simon Danczuk over very similar claims.

Dugdale’s resignation is a boon to Corbyn, and perhaps Davidson too

The left will strengthen their position inside Labour, but may push more voters towards the more centrist, avowedly unionist Scottish Conservatives.

Momentum’s hounding of Berger is a test for anti-Corbynite MPs

Will they keep their heads down as their colleagues are picked off by the hard left?

Anti-Corbyn Labour MPs – they haven’t gone away, but what do they do now?

Victory poses his internal opponents with a painful dilemma, and a lot may hinge on how they resolve it.

Richard Short: We Tories must renew our efforts to win the industrial north

Corbyn might lock Labour out of power at Westminster, but Momentum could still end up wielding real power in local government.

WATCH: McDonnell explains how Labour will ‘rehabilitate’ socialism

Apparently, some people have been using it as a “dirty word” – but he wouldn’t have a cup of tea with Trotsky, Lenin, or even Marx.

WATCH: Labour announces this year’s leadership contest winner

The incumbent wins more than 60 per cent of the vote, cementing his hold on the Party. What shall Smith’s supporters do now?

Simon Marcus: Utopianism makes the left intolerant

When you think your cause is beyond reproach, it’s must easier to demonise your opponents and justify mistreating them – and I’ve experienced the results.

May and Davidson attack Sturgeon’s ‘independence or bust’ nationalism

Also: Tory AM sets out Plaid Cymru vision; Scottish Labour de facto split off; Jones urged to stay on to block Corbynistas from capturing Welsh Labour; and more.