Allen & Overy (A&O) and Norton Rose Fulbright have won leading roles on a £160m deal that has seen Centrica make its entrance into the closely watched UK shale gas market.

Centrica, which owns British Gas, has taken a 25% stake in the Bowland shale gas exploration licence in Lancashire after negotiations with UK shale gas explorer Cuadrilla Resources and Australian engineering group AJ Lucas, which previously held 75% and 25% stakes respectively in the fracking fields.