Los Chimpos Ride Again

You get up and look out of the window.
You can see across the streets and, below, a courtyard.
Thinking to yourself, you try and recall if know how many cemeteries there are in London.
When you were a sober man, you took part in plenty of pub quizzes and, thankfully, you've retained a whole bunch of fairly useless information.
There are, if you're remembering correctly, about 140 cemeteries in London or the Greater London area.
140!
There is no way of knowing which one the note is referring to if, that is, it is referring to a graveyard at all!
This is ridiculous!

You slump back into the chair.
You decide that there must be something you are missing.

You have 1 choice: