All of the shows mentioned here are great. I would definitely recommend the IT Crowd - spot on brilliant. Whenever I see David Cameron, I think of the guy who invited Jen to the gay musical.
Also, check out Brass Eye, only available AFAIK on YouTube. Definitely way way way out there. And watch out that your kids are not exposed to Clarky Cat or Cake!
There was a short lived one called Brass. I think it involved a silent explosive. I remember a vaguely.