Labyrinth 98/270 Mansion House

I wandered into some stations this afternoon to see if their labyrinth is in the ticket hall (some are behind the barriers in passages and platforms).  
In Mansion House station, the member of staff in the ticket hall told me it was down on platform 1, and then said they would open the gate to let me go down to take a photo of it (without me asking).
So this is dedicated to that very nice Tube worker.