Address
Location
Near Old St round-a-bout.
By Tube
By Bus
Number 55 and 243 from the West End, 76 from Waterloo and 43 from London Bridge/Islington.
How to get there
There are a series of photos here which show you how to get there.
Go to Old Street tube station. Leave by exit 7 (north west) and walk west along Old Street. Just before the giant white church turn right.
The church looks slightly different at night (it's all lit up.) Keep walking along the path, keeping the railings on your left. The path will turn into a pedestrian footpath, and back again, but keep walking. After about a hundred meters you'll come across the block that the office is in on the right of the road.
They're number 64. Ring the buzzer.