I watched episode 8 of series 3 a couple of times already.
This is my version (couldn't actually help it).

The other Spooks: The search for the ring and looking good in a suit.

(click in the title to go there... It's not a fic. Sorry for the posible mistakes and for the fact that maybe you don't find it funny at all. I tried, though). It probably will make more sense if you have watched the episode in question, but I don't think is absolutely necessary. I also warn you that can be small spoilers! It's the episode where there's a baby kidnapped. His father is a rock star played by Andy Serkis... Hope this is enough ;)