Place it near the end of a travel or station clip, after the moment that looks wrong, so it reads as the sensible response. Put a game show buzzer just before it to flag the problem, then let the announcement close the scene on a clear instruction.
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This 12-second clip is a calm, official station announcement urging passengers to report anything that does not look right, giving the British Transport Police text number 61016 and closing with the slogan 'See it, say it, sorted'. It feels steady and reassuring rather than alarming, like a familiar voice over a platform speaker, and it comes from the force's rail safety campaign.