I don't know why you never went into customer service. [John shakes his head, but he's smiling.]

I'll see to it. [John clears his throat.]

Let me hold your sleeve for the balance, and I can probably move faster. It's bloody cold out here. [Provided there's no objection, John's going to put his pride to the side and grasp hold of loose fabric of Sherlock's coat sleeve so that he has something to catch himself with as he does pick up the pace to match his friend's longer strides.]