Guardian Podcasts no longer working.

Recent changes to Guardian podcasts have caused them to no longer play.

I first noticed this problem with the Guardian Football Weekly podcast, but also appears to apply to Politics Weekly, and I presume all their others.

Symptoms: Episodes are listed in the feed, the correct url is displayed under cast's details but LMS doesn't play. This applies to all episodes from early December onwards.

On investigation, the feed http://www.theguardian.com/football/...ly/podcast.xml
appears to have made a change to the location to their podcasts' content, and from http to https.

The last working content (titled: Football Weekly: Jamie Vardy, Arsenal's injury anguish and the Indian Super League):
http://audio.theguardian.tv/audio/ki...15_mixdown.mp3

The next episode, (titled: Football Weekly Extra: Gary Neville arrives in Valencia) fails to play:
https://audio.guim.co.uk/2015/12/07-...dec03-2016.mp3

the content is present, but fails to play. The same applies to all subsequent casts.

Anyone have any ideas what is wrong or how to diagnose further?

Many thanks.