But don't forget that, when it suited them, the Conservatives backed Labour's policies. In 2007 - when it appeared there might be a General Election in the wake of Brown becoming PM - George Osborne pledged to match Labour's spending for at least two years.
He's Chancellor now, so let's remember his words back then:
http://news.bbc.co.uk/1/hi/uk_politics/6975536.stm
So as shadow chancellor he either failed to understand the economy or he was lying. He can't blame Labour for doing what he admits he would have done himself.