Thames Water will send a surveyor that wont have a clue where it is, or will be working from the plans I have. It will get CAT Scanned which will find nothing but RE bar in the concrete base before any hint of pipe is located. I have already made enquiries.
Thermionic used to live down Conyers Road where the Pumping station is, and showed a great interest in the Station along with the images. When this network was built it must have been a huge accomplishment and achievement to supply reliable fresh water to South West London. The network is amazing, to think this was built well over 100 years ago without a power tool in site, this is incredible. Assuming the members of this site might have more substance than commenting on photos, if an ancestor of a member built this I would think that they would be very proud to be part of such an achievement, and may have documented it. I know its a very long shot, but there may be an archive room in the station, or even personal photos of the installation, cobbled roads dug up etc. I am interested in the Network, and thought there may be someone on here with a similar interest that may have more info to hand. Its quite obvious your not, and I thank you for your useless comment