“One day we were in the makeup trailer and someone was brushing out Benedict’s stunt double’s wig, and we decided to put Martin on it. We put Sherlock’s coat on him and stood him on top of one of those makeup chairs so he looked tall and took the photo from low down. And when Benedict came in we got the makeup assistant to ask him to autograph the photograph. She handed it over – and this is how Benedict’s mind works – and he went ‘I don’t remember wearing my coat with that color scarf.’” – Lara Pulver