The podcasts I listen to are all from the BBC, so they're scripted and produced for radio, rather than just being people chatting. Listen to e.g. [1] or [2] and it's all on topic (and being the BBC, ad-free).
[1] https://www.bbc.co.uk/programmes/p066rd9t/episodes/downloads [2] https://www.bbc.co.uk/programmes/b006r4vz/episodes/downloads
