You know you’re getting old when TV starts getting nostalgic about eras during which you were already feeling old and nostalgic. Take Pogs, the subject of one of those ‘Whatever happened to them, eh?’ moments in Badults (BBC3, Tuesday), an amiable sitcom about twentysomething flatmates. Pogs were these collectable discs originally made from fruit-juice bottle caps (passion fruit, orange and guava) that were a massive fad in the mid-Nineties.