PwC’s former head of the north of England Ian Green has been revealed as the source of an alleged leak of confidential information that is at the heart of a £63m High Court battle.

Watchstone, an insurance and technology group formerly known as Quindell, has accused Green of leaking its information to a banker at Greenhill & Co in 2015. The banker was advising law firm Slater & Gordon, which was in talks to acquire the firm’s professional services arm.