The PM has endured a steady stream of departures from across his ministerial and Downing Street teams, as well as other posts, during his 14 months in power.

Messy exit of ambassador to US was entirely predictable, leaving many to ask why PM failed to see it coming

The PM has endured a steady stream of departures from across his ministerial and Downing Street teams, as well as other posts, during his 14 months in power.