I laid the ideas out on the floor, having not seen this one before, and it was a picture of a tennis racket on a piece of green grass. Can you share a story that didn’t make the film? The film would have run for three hours if we'd done everything! But there was a lovely story Jimmy Page told about how I went up to see him with some ideas, and Storm tucked another idea under my arm.

It was easy to concoct a timeline and Trish Chetty, who wrote the script, was very diligent because people like Paul McCartney and Jimmy Page are sticklers for the truth. I just had to look at my passport, ‘Oh, that stamp says 15th July 1977, I was in California…’. I'm a hoarder – I collected bus tickets, all my passports – so I knew exactly where I was when I photographed anything to do with Hipgnosis. There’s obviously a lot of reflection in Squaring the Circle, can you speak on that sense of nostalgia? I've written several books on Hipgnosis, so consequently the stories were always very fresh in my mind.

Pink floyd atom heart mother shirt