Libby Purves is joined by Desmond Fforde, Mariatu Kamara, Richard Williams, Graham Poll.
Having set up his restaurant in Bristol, Keith agreed to film a cookery slot for local TV.
With Jenni Murray, who explores if refusing to have children is selfish.
The engineers and astronomers approach the biggest milestone in their 20-year project.
The men of Hut 33 are keen to impress a new lady friend - a French resistance operative.

The latest weather forecast.
The PCC fights back; Belle de Jour; Channel 5 newsreader; ITV changes.
A writer finds himself speaking on a mobile phone to a stranger in 1959 New York.
By Tat Usher. A teenager spends her evenings swimming lengths of her local pool.
It is summer and the garden hums with the sounds of insects. Narrated by Peter France.
Claudia Hammond asks Martin Seligman if we can all be taught to be happy.
In Prague, rumours spread that the police have killed a Czech student.
Laura Solon presents a series of sketches, monologues and one-liners.
Bill Bailey on orchestras, Fay Weldon on Nabokov and the latest Coen brothers film.
Wegg comes to an agreement with Venus, as Bradley tries to do likewise with Eugene.
Michael Buerk chairs. With Claire Fox, Matthew Taylor, Melanie Phillips, Michael Portillo.
The case of a young farm labourer who shot his wife dead with a sawn-off gun in 1934.
The first coffeehouse opens in Oxford and signals the beginning of a new age of reason.
Libby Purves is joined by Desmond Fforde, Mariatu Kamara, Richard Williams, Graham Poll.

Weather information.
As war rages in Europe, a letter from Hana brings news of the Glass Room.
Pippa tries to work out why her date with a manic depressive is going so badly.
Luke crashes his car and meets the ideal bystander after receiving some shattering news.
News, views and features on today's stories in Parliament with Robert Orchard.
Having set up his restaurant in Bristol, Keith agreed to film a cookery slot for local TV.

BBC Radio 4 joins the BBC World Service.
Charlotte Smith hears why a UK agricultural research centre is facing major cuts.