The Radio Wales documentary on Ludwig Wittgenstein - BBC Radio Wales - Wittgenstein: From Austria to Abertawe - features a a range of contributors, including Professor Ray Monk, Radmila Schweitzer and James Kelman.
Times of broadcast are available on the link below. From next week, it should be available for a month on BBC Sounds:
BBC Radio Wales - Wittgenstein: From Austria to Abertawe