‘I was booked to photograph Her Majesty’s official 70th birthday portraits. Protocol doesn’t really allow small talk. The Queen made herself comfortable in front of my camera, which was set on a tripod. Without realising, and in my nervousness, I had been fooling with the tripod and unlocked it so when I let go of the camera it fell forward heading for her Majesty. Thankfully my young assistant Patrick, blessed with quick reflexes and showing no sign of nerves, caught it and handed it back, saying, “You shouldn’t be doing that Mr Aris.” At which point the Queen burst out laughing’