The decline of Welsh in the 20th century and campaigns to save the language.

Authors including James Hawes and Niall Griffiths discuss their work.

The day's global events.

Simon Singh chairs the puzzle-based panel game with Richard Wiseman and Kathy Sykes.

Bernard Hill and Richard Briers star in this dramatisation of William Horwood's book about Esther, a 16-year-old with cerebral palsy, and her search for the truth behind stories she has heard about a man, Arthur, and his belief in the mysterious "Skallagrigg".

Dan Cruickshank examines the architectural rebirth of Manchester.

Tanya Beckett fronts a discussion on the success of urban regeneration in Manchester.

The BBC National Orchestra of Wales performs Karol Szymanowski's First Violin Concerto and Witold Lutoslawski's Concerto for Orchestra, as well as Ravel and Debussy.