But Labour leader Ed Miliband accused him of "losing control" and alienating the UK's supporters in Europe.

BBC: David Cameron

The conference - entitled Tackling Drugs in Scotland - will also be addressed by Ed Jurith, of the Office National Drugs Control Policy in Washington DC.

BBC: Aiming to break drug habit

Gordon Brown's New Deal, his Working Families Tax Credit and perhaps even his decision to give the Bank of England independent control of monetary policy owe a good deal to ideas the chancellor and his economic adviser, Ed Balls, picked up and kicked about in Washington and Harvard.

ECONOMIST: Bagehot