Come for the music. Stay for the occasional interlude about UK life, politics, and more. I think the interesting part is just how varied the music can be. There's a lot of stuff you probably haven't heard in a lot of genres and forms you're just missing out on if you tune into the radio. Dave and Caroline do a fantastic job of presenting some new and unique tunes along with their conversations about the world around them (from a UK perspective).
So if you need some tunes and some light conversation in an old school radio format...but in a podcast, you need to listen! :)