Robin likely exited the Tube at Cannon Street Station on her way to attempt to interview Gemma, a potential witness in the Shifty case, at The Vintry.

“The Vintry, which Robin reached twenty minutes later, lay near Cannon Street Tube Station in the heart of the financial district…” Troubled Blood, Chapter 63

The “Just Divorced” sign seems appropriate for Robin. 

Find Cannon Street Station on the map below: