A shale oil revolution could add up to £800 to each person’s economic output in the UK, according to a report from accountants PwC. The boost would be due to significantly lower oil prices as the world taps into the energy held in shale rock, cutting costs faced by businesses and consumers, it said. As a result, UK gross domestic product (GDP) could increase by an extra 2pc to 3.3pc by 2035, it estimated, or around £30bn to £50bn at today’s values. Hopes are high that rivalling at least part of the US’s progress in shale could offer a boost to the UK’s growth prospects and energy security.