Exhaustion and a desire to avoid a spell in opposition are factors in why a large group will stand down at next election
Whatever its result, the next election will bring a wave of change to the House of Commons.
So far, 90 of 650 sitting MPs have announced they will not be seeking re-election. Of those, 14 are former secretaries of state – 11 of them Tory – and nine are select committee chairs.
