A notion is going about that, just as readers of film reviews receive spoiler alerts, so readers of anything should get a trigger warning. Otherwise something nasty in the woodshed might trigger post-traumatic stress disorder or worse.

‘I use the phrase trigger warning myself,’ wrote Kate Maltby in a Spectator blog the other day, ‘to warn Facebook friends that they may not wish to click on a link because it is likely to automatically “trigger” flashbacks for survivors of trauma.’