Probably the single most common etiquette conflict occurs, as Mr Ling puts it, when mediated communication interrupts co-present communication, as when two or more people are sitting at a table in conversation or negotiation and one of them gets, and answers, a call.

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Open Blue farms a fish called Cobia, also known as black salmon, ling, or lemonfish.

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And, said Ling, he is confident the space will grow as society opens up to the possibilities of sharing with strangers.

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Ling won promotion from League Two to League One in his time as manager at Brisbane Road.

BBC: Cambridge appoint Ling as manager

Gary Brabin was sacked as U's boss following disagreements over the club's playing budget but Ling says he is happy with the backing he has been promised by the board.

BBC: Cambridge appoint Ling as manager

Paul Carden - who worked as player-assistant coach under his friend Brabin - will continue in his role alongside Ling.

BBC: Cambridge appoint Ling as manager