“Wallander is quite a cheerful person. It’s just he doesn’t often get the chance…”

Or so says the newly-knighted Sir Kenneth Branagh to Swedish crime author Henning Mankell in this week’s issue of RT, in which the two men discuss marriage, murder and TV’s grumpiest detective ahead of a new series of Wallander coming to BBC1 on Sunday.

Also this week:

Kate Humble joins us to introduce new BBC2 series Volcano Live, in which she predicts that a sequel to 2010’s Icelandic volcano explosion could be bigger and even more disruptive. Plus, we’ve got a free pull-out-and-keep Volcano Live holiday walks guide inspired by the series, which tells you where you can find and explore Britain’s volcanic hot spots.

Andrew Lloyd Webber joins us to share his forthright opinions about the Queen, Jesus, and racism at Eurovision and, continuing the musical theme, quirky pop star Katy Perry is on hand to chat about how her new film inadvertently captured the end of her marriage.

Thelma Madine, the dressmaker made famous by C4’s My Big Fat Gypsy Wedding, explains how she’s recently turned her hand to teaching traveller girls how to manufacture their beloved outrageous gowns, we catch up with Hugh Bonneville for a chat about the new series of Olympics-bating comedy Twenty Twelve, and Sophie Hannah explores the secrets behind TV’s greatest cop double acts.

Former F1 driver Damon Hill drops in to explain why he thinks no-one should drive faster than 55mph on Britain’s roads, Sarah Millican laments the difficulty of watching TV while on holiday, Alison Graham explains why drama works better in the dark and Neil Morrissey opens up about his ogling of female Bulgarian weightlifters. It’s all in this week’s Radio Times, available now priced £1.40.