Luke Pickering, head engineer at London’s Church Studios, explains what entices artists including Adele, Lana Del Rey, U2 and Radiohead to record there, what he has learnt from the studio’s owner, Paul Epworth, and why the beating heart of the historic building is Studio 1 – home to one of the rarest recording and mixing desks in the world, a 72-channel vintage EMI Neve console.