Some favourite episodes off the top of my head:
* Wilfred Owen - https://www.bbc.co.uk/programmes/m001df48
* The Evolution of Crocodiles - https://www.bbc.co.uk/programmes/m000zmhf
* The May Forth Movement - https://www.bbc.co.uk/programmes/m001282c
* The Valladolid Debate - https://www.bbc.co.uk/programmes/m000fgmw
* Gerard Manley Hopkins - https://www.bbc.co.uk/programmes/m0003clk
* Henrik Ibsen - https://www.bbc.co.uk/programmes/b0b42q58
* Wuthering Heights - https://www.bbc.co.uk/programmes/b095ptt5
And finally, in which three mathematicians heroically attempt to explain asymptotic analysis to (septuagenarian novelist and cultural broadcaster) Melvyn:
* P v NP - https://www.bbc.co.uk/programmes/b06mtms8