Andrew Davies was on his way to New Zealand to work on a Doctor Who exhibition, for which he was project manager. The first leg of his flight from London to Singapore was fairly smooth. Then suddenly the plane hit severe turbulence.

"Being on a rollercoaster is the only way I can describe it," he recalls. "After being pushed into my seat really hard, we suddenly dropped. My iPad hit me in the head, coffee went all over me. There was devastation in the cabin with people and debris everywhere.

"People were crying and [there was] just disbelief about what had happened."

Mr Davies was, he says, "one of the lucky ones".

Other passengers were left with gashes and broken bones. Geoff Kitchen, who was 73, died of a heart attack.