A location website reads: It was on this corner, at the junction, of Scotland Place and Great Scotland Yard, that Harry and Mr Weasley enter the phone box in Harry Potter and the Order of the Phoenix to descend into the Ministry of Magic. Unfortunately for those who seek to recreate the scene there has never been a phone box at this junction, the one in the film being a specially brought in prop that was taken away once filming had finished.

So the picture is Stuart in the fictional phone box, about to go up to his very real job. ...Making magic, heh heh.