An excellent blog post which looks at what happens to politicians after they leave office. Theresa May is the central theme, but the net is cast much wider: Losing political office
As is pointed out, the psychological costs of political exit can be high, particularly if you have no 'hinterland'. I remember being at an event where Ted Heath was sulking in a corner and being rude. Dennis Healey read me his latest poem.
Of recent prime ministers, John Major has probably made the best adjustment, in part because he is seen as a fundamentally decent guy and not as bad a prime minister as he was seen to be at the time, surrounded by rampant Eurosceptics.
PMQs today showed what political exit can look like, both the PM and the front bench looked as if they were attending a wake in a morgue, which I suppose they were.