'Going alone' on a method of measuremnt is questionable, especially for something so consequential as economics. Perhaps others - notably the UN, IMF - will fo

'Going alone' on a method of measuremnt is questionable, especially for something so consequential as economics. Perhaps others - notably the UN, IMF - will follow suit. But, perhaps a new way to measure success for Labour - and the promise of growth as a means to judge the government - is entirely the point