After a dramatic fall from grace, how long can May really last?

On her visit to Japan, Theresa May, pictured with Shinzo Abe, announced she planned to remain in the job for the long term, which some Tories found it hard to believe.Today May is not the seemingly all-powerful figure of early spring but a prime minister most in her own party see as a hugely diminished figure, on borrowed time, and gradually losing her grip on power.