The mystery pipe has been identified as a redundant water pipe that was first laid in 1868 and has now been removed.  All systems are now go, and the silt trap is being fitted as we speak!

A 3.5 metre hole has been dug:

A concrete slab laid:

The collection chamber inserted:

The hydrodynamic separator inserted:

The road should all be back to normal by Friday, and then it’s on to the next site in Denmark Road on Tuesday!