The Why Factor asks why some people believe in conspiracy theories and whether it matters
BBC World Service
Marie-Louise Muir unpicks the mystery of keening for the dead in Ireland.
BBC Radio Foyle
BBC Radio Ulster
Mike Oldfield talks to Matt Everitt about the key musical moments of his life.
BBC Radio 6 Music
Na bha tachairt sa Chiad Chogadh ceud bliadhna an ama seo. Le Gilleasbuig MacDhòmhnaill. (R)
BBC Radio nan Gàidheal
Cathy FitzGerald takes a walk around 17th-century Kyoto. (R)
BBC Radio 4 FM
3/3 Essex and his troupe are invited aboard the royal yacht to entertain King Edward VII.
BBC Radio 4 Extra
Musicians Kizzy Crawford and Gwilym Simcock carry us to the Celtic rainforest of mid Wales
BBC Radio 4
An expose of firms offering to produce fake papers to enable migrants to get into the UK. (R)
The simple wonder of flight and the curious idiosyncrasies of life in the cockpit.