The missions of MI-5, the UK's domestic intelligence organization.

Ruth Evershed: Shall I hit him again Adam?
Adam Carter: Only if you want to.
Colin Wells: Didn't we bug this suite when Bill Clinton used it?
Malcolm Wynn-Jones: We did.
Colin Wells: Happy days!
Danny Hunter: Earl Grey tea bags.
Zoe Reynolds: What?
Danny Hunter: You didn't get any.
Zoe Reynolds: Why would I get *you* Earl Grey tea bags?
Danny Hunter: I like them.
Zoe Reynolds: Look, we have a flat share, okay? We are not married!
Danny Hunter: Is Earl Grey tea bags married?
Zoe Reynolds: Oh, yes!
Home Secretary: You know, back in my days as a student radical, our dreams were all about the glorious proletariat.
Harry Pearce: We've still got those dreams on file somewhere.
Harry Pearce: Oh, shag.
Danny Hunter: [decides to sacrifice himself] You will never win. Acts of Hate often bring forth Acts of Love and so you will never win. In another World, you might be tied to this chair and I might be holding the gun. So I suppose you've been unlucky. But you will never win.
Al Qaeda Man: [infuriated, embarrassed] I'm... unlucky?
Fiona Carter: Danny, don't!
Danny Hunter: If I weren't tied to this chair, I would be up in your face, you Death-Worshipping Fascist!
Al Qaeda Man: And you know what my answer would be.
[Shoots Danny in the back of the head]
Danny Hunter: I may not be able to do everything I want to do to you, but there is a lot I can do.
Jools Siviter: Little tinkering Tom here is responsible for this mess!
Tom Quinn: Colin, when the word "Yes" will do, use it.
Jools Siviter: Bug your own office, do you, Harry?
Harry Pearce: Only for special occasions.
Adam Carter: I was just shoring up an asset.
Harry Pearce: Oh, is that what they're calling it these days?
Tariq Masood: [confronting Calum] I've met a lot of people like you. Piss-takers. You go through life finding everything so easy you think it's all a joke.
Harry Pearce: ...before he got religion - if world anarchy *is* a religion.
Harry Pearce: We're in a state of collective desperation here.
Jools Siviter: Lively on this side of the river, isn't it?
Jools Siviter: The great joy of an obo post is that the Powers can't see how much you're drinking.
Ruth Evershed: I was on an operation where a Conscience exploded. Five people died.
Lucas North: This job is a Machine that chews up good people and then spits them out!
Jools Siviter: And you brought little terrier Tom along with you, what a nice surprise...
Danny Hunter: They're going to kill us.
Fiona Carter: At least we're together, Danny.
Malcolm Wynn-Jones: He's done it!
[Smiles, then his face falls]
Adam Carter: [Having swerved the car into the middle of a deserted public square, Adam Carter leaps out. The bomb detonates. Adam Carter disappears into the fireball mid-run]
Tom Quinn: So how did it go?
[Harry is silent]
Tom Quinn: Oh, that's right, I forgot. I'm a Civilian, now!
Harry Pearce: ...You are.
MOD Desk Officer: They're making a map of Secret Britain. They want the public to know just how much is being kept from them. I quite agree with them, actually.
Tom Quinn: And so you just handed it over! Without a thought that they might be working against us.
MOD Desk Officer: What's going to happen to me?
Danny Hunter: Bad things.
[Tom and Danny leave. The Desk Officer starts to tremble and puts his head in his hands]
Ros Myers: [comprehensively beats up a tail] Follow me again, and I'll get really cross.
Double Agent: You're so young! Too young to be wasting your life with this nonsense...
New Recruit: [Still typing away, close to the incriminating data] It's my duty.
Double Agent: [She garrottes him to death with a ring-wire]
Jools Siviter: Are we going to have to come over the river and potty-train you people?