Our parents saw things differently, picturing their children as innocents suddenly exposed to noxious influence. So Colin’s mother referred to me as his ‘dark angel’; my father blamed Alex when he found me reading The Communist Manifesto; Colin was fingered by Alex’s parents when they caught him with a hard-boiled American crime novel. And so on. It was the same with sex. Our parents thought we might be corrupted by one another into becoming whatever it was they most feared: an incorrigible masturbator, a winsome homosexual, a recklessly impregnatory libertine. On our behalf they dreaded the closeness of adolescent friendship, the predatory behaviour of strangers on trains, the lure of the wrong kind of girl. How far their anxieties outran our experience.

One afternoon Old Joe Hunt, as if picking up Adrian’s earlier challenge, asked us to debate the origins of the First World War: specifically, the responsibility of Archduke Franz Ferdinand’s assassin for starting the whole thing off. Back then, we were most of us absolutists. We liked Yes v No, Praise v Blame, Guilt v Innocence – or, in Marshall’s case, Unrest v Great Unrest. We liked a game that ended in a win and loss, not a draw. And so for some, the Serbian gunman, whose name is long gone from my memory, had one hundred per cent individual responsibility: take him out of the equation, and the war would never have happened. Others preferred the one hundred per cent responsibility of historical forces, which had placed the antagonistic nations on an inevitable collision course: ‘Europe was a powder keg waiting to blow’, and so on. The more anarchic, like Colin, argued that everything was down to chance, that the world existed in a state of perpetual chaos, and only some primitive storytelling instinct, itself doubtless a hangover from religion, retrospectively imposed meaning on what might or might not have happened.