[John glares at Lestrade, looking positively mutinous. He smooths that expression over after a moment and locks into something cool and calm... Captain Watson.]

He's got ricin poisoning. Of course we aren't going anywhere for a while.

[Which is to say, John seriously doubts Lestrade can keep them under house arrest longer than that.]

Molly needs her car back. And why d'you think we contacted you? We work together, detective inspector. It's my understanding that's how you've worked with Sherlock on the past. We don't have all of your resources, and you don't have all of ours. Or have I missed something?