I disagree with you strongly with you about Margaret Thatcher, nanna8. She did not destroy many lives, she destroyed destructive and outdated union practices and broke the grip of the unions on Industry. Now Rayner, only in Parliament because of union support, is considering standing for PM; more treachery.
Starmer is driven by his own ideology, which is not that of the current Labour party.The present disaster has erupted because of his appalling decision to appoint Mandelson despite awareness of his links to Epstein and knowledge that the Files were under investigation and contents likely to be revealed. He has worked with Mandelson throughout his parliamentary career and used his Machiavellian skills to his advantage, he thought. Now they have rebounded on him.
It is Starmer's flawed character which has destroyed him; hubris.
As to his successor, at present, no idea. What a state to be in, with the awful example of the Tory downfall still fresh.