Sharpleshall Street is a tiny road in north London that is barely visible on the map. Its name plates are either painted over or obscured by trees, and spotting number 11a is difficult because it is hidden down a small alley. But in the evening, at least, the entrance to the 10,000 sq ft former dairy and recording studio is illuminated with fairy lights. Above the door is a sign made with crazy lettering, reminiscent of the word sculptures of the American artist, Jack Pierson, which reads “Museum of Everything”.