Plus: Nostalgia at the V&A needs a personal playlist and Rh-app-sody for the iPad

"Rome wasn't built in a day and Alan Sugar didn't become a millionaire overnight," said Sharon, one half of the nascent trading empire Sharon and Al, in Wheelers, Dealers and Del Boys. Sharon was wondering whether she might have been a little hasty in giving up her day job to concentrate exclusively on trading in tat, and this remark was by way of self-reassurance.

"Every sequin, stitch and seam provides a window on to her short but extraordinary life," said the voiceover at the beginning of Princess Diana's Dresses: the Auction, an instructively besotted film about the sale of 10 of Diana's frocks. "These dresses," it had already promised, "hold the key to understanding Diana as never before." An hour later, with your understanding of Diana unchanged by a single stitch, any doubt about that claim had hardened into certainty.

Also: Broken by Battle, BBC1

Top of the Lake, Sat, BBC2 // Alive: Rankin Faces Death –  a Culture Show Special, Sat, BBC2

Plus: All the world's a stage...well, nearly; and what's the difference between "canned" and "studio"? Don't make me laugh

Some wary prejudices can be dissolved with greater knowledge

Michael Mosley, one of the more cheerful pop science presenters currently on screen, would like us to know that appearances can be deceptive. He might look happy, but he's not. "I get stressed and constantly fret about the future," he said at the beginning of Horizon: The Truth about Personality.

The groundbreaking show tested your own ability to suspend prejudice and attend only to evidence

Until play actually started the BBC must have been quietly satisfied with its Wimbledon coverage. Or at least relieved. With an hour or so gone and virtually the whole country watching, at least none of their commentators had triggered a Twitter-storm – as John Inverdale had done the day before with his less-than-chivalrous remarks about Marion Bartoli and the hitherto unexplored Appearance/Trying Really Hard nexus.