A report by the British Geological Survey (BGS) has found there are an estimated 4.4 billion barrels of shale oil in vast parts of southern England.
The study of the Weald Basin, which stretches from Wiltshire to Kent, found there could be 2.2-8.5 billion barrels of shale oil. The BGS stressed that these numbers are for resources and not reserves. Shale oil exploration in the US has only been able to access up to 10% of the total oil.
By comparison to the Weald Basin figures, around 40 billion barrels of oil have already been extracted from the North Sea. The study also found there is unlikely to be any shale gas potential in the area.
More top news
Unpaid internships should be banned to prevent young people missing out on jobs in top professions, a new report has said.
The study by the National Childbirth Trust and National Federation of Women's Institutes found a lack of staff left some women frightened.
Extracts released by 10 Downing Street suggest Mrs May will say the UK will not settle for a "half-in, half-out" policy.