I just discovered that work starts tomorrow on Waldram Crescent - which is the section of the South Circular that goes under the railway bridge at Forest Hill Station.
It seems that work will start tomorrow and last until 8th April.
( see images below, or this link)
I believe this must be the third or fourth time Thames Water have had to dig up the exact same location outside the new flats / nursery.
If you drive on the South Circular, this is probably going to be rather busy, but at least it is the Easter holiday period
