President Donald Trump was in London to visit the Queen. I watched him parade up the Mall in a black armoured car, accompanied by mounted members of the Queen’s Guard.

I was not there in person, but saw this all on television in an old-fashioned electrical shop. I mentioned to the shop owner that had I been in London myself, I would have liked to have photographed this spectacle.

‘No problem’, he replied, pushing a small box across the shop counter towards me.

‘I’ll put a 3.5 inch floppy disk in here. You press the button when you want to take a shot, and you’ll get your picture. If you could make a copy of the disk at home and then return it to me by post, I would be most obliged.’