@Ken Bingham good point Ken but the area is blocked off, most people can just have a look inside. However, I leaned in placed my tripod and lined it up as best I could then made the exposure.
The old piss station, doesnt have a chain on the cistern, so must of been continual flow, fill up and self flush, when water was cheap and plentiful. The wastes couldnt be made from copper as the urine would eat it out. They use to crystalise and block up over time, had to use costic soda to unblock, if that didnt work add some hydrochloric acid and run.