Guardian: Drilling for oil close to the West Sussex village of Balcombe has begun following a week of blockades and protests by anti-fracking activists who fear that the possible use of the extraction method could lead to the pollution of water courses. Cuadrilla, the oil and gas exploration company headed by the former BP boss Lord Browne, said work started at around 11.30am on Friday and drills would penetrate more than 900 metres (3,000ft) into the Sussex shale to test for the availability of oil reserves....