Joan Collins, Castiglione, Ian Rankin on Rory Gallagher, Drinking Buddies

With Mark Lawson.Joan Collins on her new memoir, picking the wrong husbands, not giving away her age, and why she wasn't the first choice for the now iconic role of Alexis Colby in Dynasty.The first major UK exhibition of 17th Century artist Giovanni Castiglione is opening this week at Buckingham Palace. Castiglione led a turbulent and violent life, but he was an innovative artist who invented the technique of monotype which is still used by artists such as Tracey Emin, whose works can be seen alongside Castiglione in Gifted: From the Royal Academy to The Queen.The work of crime writer Ian Rankin and the late Irish musician Rory Gallagher is paired up on a new concept compilation album - which features a story inspired by music which was in turn inspired by crime fiction. Ian Rankin and Rory's brother, Donal discuss the project with Mark.Indie film Drinking Buddies explores the relationship between two brewery co-workers who seem perfect for each other - except they're both in relationships with other people. All the dialogue is improvised. Rosie Swash reviews.