Joan loves how Ted is so thoughtful and caring. She knows he's aware that she hasn't eaten much. And he's right, these sandwiches will be miles better than the fare they're likely to find at the airport.

Once they're in the cab Joan texts Sherlock to let him know they're coming, and Sherlock texts back in his usual txtspk that he'll be ready when they get there.

That done, Joan puts her phone away and leans against Ted.