Sam Leith's guest on this week's Book Club podcast is Nicola Barker, talking about her new book TonyInterruptor -- about how a man who interrupts a free jazz concert becomes a viral sensation on social media. Nicola tells Sam why some of her books are bouts of the flu and some are sneezes, how hard she works on her apparently spontaneous prose, why she remains devoted to reality television — and about the time she went to visit Martin Amis with a ghetto blaster.