One of Our Episodes of The Moral Maze is Missing

I just saw a tweet from the redoubtable Jane Kelly: 

The Moral Maze on Wednesday not available. About immigration, replaced with an anodyne repeat from a previous series & taken down from BBC Sounds. Perhaps Michael Buerk was right about a growing intolerance of free speech at the BBC?

Update: Ah, it was 'technical issues' on the night apparently.