Thanks for finding that information. Text for those who don't want to click through:
Start date: 06 September 2010
Duration: 10 weeks
Location: Waldram Crescent, London SE23 (Forest Hill)
Description:
The current planned start date for this essential work is Monday 6 September, although this date may be subject to change.
Due to the nature of our work, the following restrictions will apply once work gets underway:
Stanstead Road and Waldram Crescent will be closed (access to residents will be maintained). Traffic will be diverted via the alternative entrance into Stanstead Road at the junction with Sunderland Road near The Telegraph public house.
Temporary traffic lights will be installed on the A205 South Circular at the junction with Waldram Crescent and Stanstead Road by the Co-op Convenience store
Residents living between Rojack Road and Waldram Crescent should be aware that the road will have two-way traffic rather than the current one-way system. There will be no access to the A205 during these works due to the closure at Waldram Crescent.
Parking will be restricted in the affected roads due to the heavy plant and excavations on site.
I assume when they say Waldram Crescent will be closed (ie the stretch of road that passes under the railway bridge), they just mean no entry into Stanstead Road at that junction, not that the South Circular will be closed.
There's no mention of the Perry Vale road closure though.