12:03Stories in SoundTo Whom it May ConcernBBC Radio Ulster Duration: 27 minutes Sun 31st Dec 2017, 12:03 on BBC Radio FoyleAvailable for over a yearListen nowProinsias O'Coinn sets out to untangle the secret history of a vintage army jacket with a mysterious letter in the pocket.GenresFactualFormatsDocumentariesBrandStories in Sound Source: BBC Online