Stefan Rousseau / PA Wire/Press Association Images

Corbyn has struggled to gain the loyalty of Labour MPs, apparently prompting someone close to his office to produce a list of which of the party's politicians they can rely on.

The list divides almost all 230 Labour MPs into five categories. There's a small "core group" of true supporters such as Diane Abbott, a "core group plus" of MPs who are vaguely supportive of Corbyn such as Tom Watson, and a much larger "neutral but not hostile” group of Labour MPs such as Andy Burnham.

But there's also a substantial number of Labour MPs such as shadow cabinet minister Jon Ashworth who are listed as “core group negative”, plus a number such as Michael Dugher who are down as simply “hostile”.