Late one night in 1917, at the height of the First World War, Winston Churchill beckoned to a fellow Liberal MP to join him for a final look inside the deserted Commons chamber. Everyone else had gone home. “All was darkness,” wrote the MP in his diary. “We could dimly see the table, but walls and roof were invisible. ‘Look at it,’ he said. ‘This little place is what makes the difference between us and Germany. It is in virtue of this that we shall muddle through to success & for lack of this Germany’s brilliant efficiency leads her to final disaster. This little room is the shrine of the world’s liberties.’”

Smile at the romantic rhetoric if you wish, but Churchill was correct. That