[Mycroft swings his umbrella into place, as he leads Lestrade along the road, twirling it a little. He is in a much better mood now, because he has Gregory to himself and nothing to tie him to a long and tedious afternoon.]

Then you are a more patient man than I - I do not suffer fools for such things. [Mycroft sighed, quietly.] Which is part and parcel why being indispensable is a cross to bear.