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Rob's guest this week is the veteran correspondent and author, Kate Adie

Sarah's guest this week is the illustrator and Children's Laureate, Chris Riddell.

Sarah's guest the week is the record producer, Tony Visconti

Sarah's guest this week is the actress, Sally Phillips

Rob's guest this week is the actor, Tom Conti.

This week Rob's joined by the thriller writer, Lee Child.

Sarah's guest this week is the actress. Tamsin Greig.

Sarah's guest this week is the musician and broadcaster, Guy Garvey

Rob's guest this week is the author, Malorie Blackman

Rob's guest this week is the astronaut, Helen Sharman.

Sarah's guest this week is the mathematician, Marcus du Sautoy

Rob's guest this week is the author, Francesca Simon

This week Rob's joined by the actress and director, Janet Suzman

This week Sarah's joined by the actor, Adrian Lester.

This week Rob's joined by the broadcaster and journalist, Kirsty Wark.

This week Sarah talks to the poet and novelist, Jackie Kay.

Rob's guest this week is the actress, comedian, writer and presenter, Rebecca Front.

This week Rob's joined by the playwright and screenwriter, Lee Hall.

Rob's guest this week is the author Tracy Chevalier.

Sarah's guest is the space scientist, broadcaster and presenter, Dr Maggie Aderin-Pocock.

Joining Sarah this week is the broadcaster, writer and former MP, Gyles Brandreth.

Rob's guest this week is the actor and director, Samuel West.

Rob's guest this week is the poet, playwright, and broadcaster, Ian McMillan.

This week Sarah’s guest is the author, Louis de Bernières.

Rob's guest this week is the poet and dramatist, Liz Lochhead.

Rob's guest this week is the actress, Jane Lapotaire.

This week Sarah's joined by the actor, Antony Sher.

Rob's final composer-guest this week is Mark-Anthony Turnage.

Composer Roxanna Panufnik joins Rob in the studio today

Rob's joined by the composer Max Richter, live in the studio.