Various: The Queen is to set to ‘go green’ by having her two gas-guzzling state Bentleys converted to run on biofuels. This is part of a move by the British luxury car-maker to become more environmentally friendly – and a new biofuel-burning high-performance car is expected in the New Year. The Volkswagen-owned, Crewe-based company is to produce a new range of engines which will offer a 40 per cent improvement in fuel economy by 2012, with all new vehicles able to run on the plant-derived …