Thank you for this,
The URL doesn’t seem to be working, then – clicking one of the Sermon Series choices just reloads the page where the Sermon Series block is located. Accordingly, when I put the podcast block on that same page, it did correctly update the podcast block to the sermon series I selected. (But I had originally wanted to put the Sermon Series block on a different page to the player.)
It does the same on your demo page, by the way.
Thank you for your help,
Mark