[She resists the impulse to tell him that there's no need for him to pay her back, because she has a feeling that he would only take it as a blow to his pride. It's a shame, because she really doesn't need it back. She earns an excellent wage and barely does anything outside of work and so she has a lot of money to spare.]

I know you will, John.

[See, no worries, just a casual loan between friends.

She follows him to the nearest tube station and consults the map just inside the entrance, tracing the journey they need to take.]

Only seven stops, not that far. Are you sure we shouldn't call DI Lestrade to meet us there? This seems like-- isn't it something the police are best involved with?