RATs on the Bridge!!!

I made full use of the unseasonably gorgeous weather by opting for the scenic route home tonight--- along the Thames Path.

As I walked my bike past the tower (no cycling allowed - not that the sheer volume and unpredictable stopping/veering nature of the tourists that are everywhere would allow for cycling) I noticed the RATs on the bridge. Didn't look like they were physically doing anything, so perhaps some inspection work ahead of the upcoming Olympics?