Response to my Prominent Gamma-L "low pressure" comment from GiveADogABone on ECW
"As a clarification, the pressure under consideration is not absolute or gauge; it is the differential pressure across the pump suction and discharge; the delta p if you like. The flowed output of the pump can be stabilised by a backpressure valve or a control system."
On the glass/reflections ... I have wandered up and down streetview, and seen reflections in particular windows change with angle. I am convinced that there was glass in the window on Feb 12, 2015 (Bing, 7 days before the 1MW started operations), April 2015, July 2016 and therefore most likely all the way up to Wong's Feb 10, 2017 visit when he says the panes were missing (with emergency-call workers on site!).