Thanks for feedback. I just realised I should have posted this to Ask HN - oops, I'll do that today.

I see what you're saying. The content is only spoken word (no music) so perhaps that should be stated explicitly. I haven't been sure about using the word podcast because it is off putting for some people and it doesn't necessarily mean audio (podcasts can be video too).

Maybe I should do a quick on the ground survey to see what term I should use - podcast, audio programme, spoken word programmes....