[It was the stress honestly -- Mycroft never would have admitted such things even under extreme duress -- but his sleep had not been the best lately. He realized it, felt himself internally wince ... and then saw Gregory push it aside.

Well, that did it. Right there. Even when he was completely obvious, Gregory was just going to ignore it.]

Yes, yes, you're welcome. It's a door, Inspector, not the Crown Jewels. [He sighed, waving the other man through.] Let's just get this overwith, shall we?