A nice easy one, I suspect, even without Googling. What does Tony Blair have in common with Sir Stafford Cripps, Roy Jenkins, John Stonehouse and Neil Kinnock - but most definitely not Peter Mandleson?
All of the above left the House of Commons by being appointed Steward of the Chiltern Hundreds. Mandleson left by being appointed to the other "office of profit under the crown" traditionally used for this purpose, Steward of the Manor of Northstead.
no subject
Chiltern Hundreds