The Mercury Prize 6 Music, 8pm

If you can’t wait until 9pm for the BBC4 coverage (see below), Tom Ravenscroft is also bringing us the event, along with Matt Everitt’s guide to the nominated albums by artists, including Collapsed In Sunbeams by Arlo Parks (above).

It’s a concept that began on university campuses, but now the Safe Space (Radio 4, 11.30am) has also become common in the arts. This documentary asks how to balance the desire to offer protection from prejudice with the need for art to challenge and provoke.

In 2009, John Fletcher became the first man in Scotland to donate a kidney to a stranger. He tells Clare Balding about it in Ramblings (Radio 4, 3pm).