Assessing UK shale will take 5 years and 20-40 fracked wells.

Guardian: “It will take five years and the drilling of 20 to 40 fracking wells to judge whether the UK has a viable shale gas industry, the chairman of the only company yet to have used modern hydraulic fracturing techniques here has told the Guardian.”
Lord Browne of Madingley, former chief of BP and now chairman of Cuadrilla, said the work must be done, because exploiting shale gas was “a national imperative”.”