On: BBC Radio 4 series In Our Time contains talks of many mathematical topics [pdf]

The science ones are often the weakest, though. Melvyn Bragg is well out of his depth on those topics. My favourite episodes were The Calendar <https://www.bbc.co.uk/programmes/p00548m9>, The Great Fire of London <https://www.bbc.co.uk/programmes/b00ft63q>, and Politeness <https://www.bbc.co.uk/programmes/p004y29m>.