BBC Four HD

Programmes start at 7.00pm.

Ben Garrod seeks out the big part that bones can play in reproduction. Through sexual selection, the skeleton has adapted to aid courtship, competition and even copulation.

The Edwards mark their 49th wedding anniversary in the picturesque seaside town of Tenby.

Stately sitcom. Audrey puts her back out fetching in the firewood.

While walking by an idyllic riverbank with Richard, Hyacinth conceives one of her most ambitious plans: to hold a riverside picnic as graceful as one of her candlelight suppers.

Documentary series. A look at how the Normans developed from a band of marauding Vikings into the formidable warriors who conquered England in 1066.

Debut feature documentary from filmmaker Myrid Carten, which unfolds as a powerful exploration of family, addiction and unconditional love. Contains very strong language.

Professor Jim Al-Khalili shows how mathematicians and scientists such as Euclid, Galileo and Ole Roemer have used light to reveal almost everything we know about the universe.