Naga Munchetty hosts the first show of a new series. In this week's programme: the shocking death of Jo Cox – what are the implications for MPs and society as a whole? Sir Cliff Richard will face no further action over allegations of historical sex abuse – should he ever have been named? And, as astronaut Tim Peake returns to Earth, should this be the launching pad for more spending in space? Also, on the programme, Naga interviews evolutionary biologist Professor Richard Dawkins about why he is such a committed atheist.