RADIO CHOICE

■ THE French soprano Sandrine Piau (pictured) is live from Wigmore Hall this afternoon, performing songs on the themes of leaving and longing. Sandrine begins the RADIO 3 LUNCHTIME CONCERT (1PM) with Schubert’s Kennst Du Das Land? The words come from a poem by Goethe, and are full of yearning for a longlost land where lemon trees blossom and ‘golden oranges glow amid dark leaves’.

■ DON’T let the daft title put you off the fascinating returning series NATUREBANG (RADIO 4, 1.45PM), about the mysteries of the natural world, which continues through the week. Octopuses are thought to have nine brains and the ability to make different decisions in each of their eight limbs. Today’s episode investigates the complex neural network of the octopus,

and whether its mind is separate from its body.

■ ‘WE ARE the last people on Earth, and the last to be free: our very remoteness, in a land known only to rumour, has protected us up till this day.’ These words were recorded by the Roman historian Tacitus. In the first of the 15-part series THE ESSAY: UNEARTHING BRITANNIA’S TRIBES (RADIO 3, 10.45PM), the archaeologist David Miles looks at the lost Celtic tribes of Iron-Age Britain, beginning with the Cantiaci, who lived in what is now Kent, and were the first to fall to the invading legions.