player.xml broken

[Mark Barnes]

I've been using player.xml URLs to download the programmes available in a series or brand. Unfortunately, most of them have stopped working in the last few days, and return "Invalid Page Number".

This doesn't work: http://www.bbc.co.uk/programmes/b006qfz6/episodes/player.xml
But this one does: http://www.bbc.co.uk/programmes/b006r9xr/episodes/player.xml 

Does anyone know a way in which I get a list of every programme in a series, so I can use get_iplayer to download them?