The difference this time round is that the political fallout is further in the future. When Darling made his PBR forecasts, he had to start backtracking - embarrassingly - almost immediately. With forecasts for 2011 and beyond, the backtracking can wait. All Brown & Co. are concerned with is making it look like they'll not only get us through the recession, but will lead the country into a Brave New World after that. If that helps them hang onto power, then mission accomplished. But if it doesn't, then economic growth in 2011 becomes the Tories' problem.