Jeff is part of Mark's team of "drones" for Project Zeus. This is despite their rivalry in past series, though it's safe to presume Johnson just ordered Jeff into this role. Other members of Mark's team are generally nameless, though Sophie is included in the team's brainstorming.
(About Big Suze)
Jeremy: God, I only asked her to be a hooker, it's not like I asked her to be in telesales.
(After kissing Sophie)
Jeremy: (Thinking) No, I was right. That was a terrible idea. That's probably the stupidest thing I've ever done in my life. Though maybe actually screwing each other will kind of make it weirdly better!
Sophie: I was quite shocked when you called Kathy a knucklehead, Mark.
Mark: No I didn't!
Sophie: Yes you did. You said she was a knucklehead and she should knuckle down or you'd knuckle her fat head.
Johnson: I'm not going to beat around the bush, Jeremy. I want to make you a real life indecent proposal.
Jeremy: An indecent proposal?
Johnson: I want to sleep with your girlfriend, Jeremy, but I don't like playing the game with women. I don't like listening to them, I don't like talking to them but I do like some of the things they do.
Jeremy: Oh, I've got a sweater around my shoulders, I'm not a corporate cocksucker - I'm a human being. Sure.
Johnson: And if we succeed, I'm going to be Charles and you're going to be Camilla.
Mark: (Thinking) I'm going to be Johnson's queen! If the public will accept me, I'm going to be Johnson's queen!
Mark: I do sort of like it when he's rude to me. Hopefully that's more a psychological defect than a sexual thing.
Johnson: Don't be alarmed, Mark, it's just Tai Chi. Take a seat, and I'll just power through...should take 45 minutes, I'm done in 10. Stick that up your dojo.
Jeremy: Is this a terrible idea? It can't be. It's in a film. They wouldn't put a terrible idea in a film - they'd get sued.
This episode marks a long tradition of episodes "not ending correctly". At the end of the episode nothing is cleared up and the events have yet to come to a close. This is presumably due to a result of the show only being a half-hour long each week.