Have you just......? it WAS you wasn't it!

On my recent trip to London [just got back, Sunday evening] I spent Friday morning on a tour with PhotoWalks of London.
The guide had us switch off the automatic function and spent a good couple of hours getting us used to doing our own settings of speed, aperture etc.
He exposed us [pun intended] to the preparation of the palace guard, both foot soldiers and cavalry, and I managed to get this shot through the fence of the barracks.