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After returning to the UK, Mr Khalife sent his original Iranian contact an audio message which said: "I delivered a package to them, which I don’t think I should tell you - but just don’t mention it to anyone."

Your kids probably pick up on your money stress, even if you don’t mention it, the experts said.

“Don’t mention it. Now let’s hurry!”

When a German pilot shot down a Pe-2 dive-bomber and found that a woman had been flying it, his commanding officer told him: “Don’t mention it to anyone. We don’t shoot at women.”

You try to put it out of your mind, and you don’t mention it to others.