I will give you another case of a misconceived consensus, this time among economists and governments, rather than intelligence services and governments. When, in October 1990, Britain joined Europe’s Exchange Rate Mechanism, there was an extraordinary unanimity of support. The Conservative government of the day was backed on this by both Labour and Liberal Democrat. Every single newspaper supported it, including such normally Eurosceptic papers as the Telegraph and the Mail. Even the Economist, which historically had been a staunch opponent of attempts to fix exchange rates, applauded our joining the ERM.