When you’re in a crisis, you discover very quickly who your friends are. Or perhaps more accurately, who your friends aren’t.

This week, David Yelland and Simon Lewis examine how different types of friends are deployed to the PR front line when it comes to reputational combat.

When you can't defend yourself in public, you need the right sort in your corner. But not all friends are equal. There's the named friend, the unnamed friend and the showbiz favourite - 'close friend of the couple'.

And David and Simon reveal there are often PR campaigns going on behind-the-scenes to ensure the best calibre of friend is speaking up - and why a 'source', a 'spokesperson' and a 'friend' might actually be the same person.

On the extended edition on BBC Sounds, a moment of indulgence as When it Hits the Fan reaches its 100th episode. David and Simon explain what's surprised them about the world of PR since the show started - and why they've had to think differently about the world they move in.

Producer: Duncan Middleton