I'm afraid that this is a bit of a badly-curated wander, where I mostly just popped out to find out a little of the history of Underfall Yard and poke around the various open workshops, and, in hindsight, really didn't take pictures in any kind of coherent order. So there's a lot of pictures, but they don't really tell the story that, in hindsight, I seem to have been trying to tell, of the unusual electrical substation in Avon Crescent, the Bristol Electricity that predates the National Grid but is still in use, the history of the hydraulic power house... It's a bit of a mess.
But I suppose sometimes these wanders—always chronologically presented in the order I walked and took photos—simply will sometimes be a bit of a mess. Let's hope you still get something out of it, anyway...
I've really taken all these photos in the wrong order, haven't I? This is an overview of the last many shots. The visitor centre is the right hand side of the building. The chimney behind is for the boiler that was inside in the days of steam. In the roof above the visitor centre was the header tank. The pump room we were in is where the open door is between the visitor centre part and the accumulator tower, on the left-hand end. Inside the tower is the old accumulator, and on the end of the building is the newer external accumulator, which as you can see has now descended fully to the ground as the hydraulic power has dissipated.