George Osborne was last night told he was 'playing with fire' by persevering with strict austerity policies as the economic outlook in Britain was downgraded. The International Monetary Fund slashed its UK growth forecasts to a mere 0.7 per cent in 2013 and 1.5 per cent in 2014 – a 0.3 percentage point cut for each year. The highly respected global watchdog also said the Chancellor should consider watering down his plans to cut the deficit as its doubts hardened over his tax hikes and spending cuts. Olivier Blanchard, chief economist at the IMF, said Mr Osborne is 'playing with fire' by pressing ahead with austerity before the recovery gathers pace. He added: 'In the face of weak demand it is really time to reconsider an adjustment to the fiscal consolidation plans.' Despite the criticism, the IMF still expects the UK to be the fastest-growing major economy in Europe in 2013 and 2014 – outstripping Germany, France, Italy and Spain. In its latest World Economic