I've had what I think is my best ever fanfictional plot bunny...
Cptn Jack Harkness is tired of not getting any older as the twentieth century goes on. In late 1973, he decides to go on a bender in Manchester. Little does he know that the man he meets in a bar and ends up fumbling down a dark alley is Dan Chambers, a scrote involved in the latest wave of gun crime in the city.
Jack is pulled in by the police for lewd behaviour after someone sees him in the alley, but the person reporting the crime is too scared to name Chambers as the man he was with. CID get involved, and Sam Tyler suggests that Jack can help them to bring Chambers in, despite his DCI's protests at using a puff for detective work.
Jack doesn't get on with Gene, but he steadily forges a firm friendship with Sam, who sees something similar in him but can't quite put his finger on it...
***
Extract:
"Can I have a word with you, DI Tyler?" Gene said, grabbing him by the collar and dragging him out of the 'interview' room. When he had him outside in the corridor, he didn't let go. "What do you think you're playing at?"
Sam shrugged him off and straightened his shirt. "We've been trying to bring Chambers in for weeks, Gov. I was merely suggesting that the we take advantage of the only actual link to him we've been able to find."
Gene grimaced. "I don't like it, Sam. He's a puffter."
"He's the only person we know to have had any... dealings with Chambers in God knows how long. And he seems willing to help. If we don't give this a go, Gov-"
"Alright, alright," Gene said, raising his hands and leading the way back into the 'interview' room.
Jack was leaning back in his chair and smiled as they reentered. "I wish all police forces were run as effectively as this one, DCI Hunt," he said with a twinkle in his eye.
"Yes, well don't forget that, Harkness," Gene said. "DI Tyler will be taking over this investigation now, won't you Sam?"
Sam raised his eyebrows but nodded.
"And if I hear you've been dishonest with us, Harkness," Gene continued, but he trailed off after deciding that his insults were best saved for manly criminals who didn't smile so much. "Get on with it, Sam," he said, and walked out.
For a moment there was silence in the room as Sam sat down at the table. "Well, well, well," Jack said. "It's just the two of us now, Sam Tyler." Then his face lit up. "Hang on, you're not related to Rose, are you?"
"Rose?"
Jack shrugged. "I don't suppose you'd know yet if you were."
Sam gave him a puzzled look.
***
P.S. Or I could just write a Life on Mars zombiefic... Meh, I wish I had time for these things :/