Trading in Ideas and Knowledge argues that knowledge services — in essence selling specialised brainpower - is the one category of economic activity in which the UK appears to be leading the rest of the world. Analysing official trade figures, the paper finds that in 2005, the UK exported about £75 billion worth of knowledge services — up from £28 billion in 1995, a rise of 170 per cent — and now worth some 6.3 per cent of GDP.