I questioned the fact that the number of hours being worked did not seem sufficient for the level of disruption being caused and received this reply:
Dear Sir/Madam

Thank you for your email.

There are Southern Gas Network (SGN) works currently being undertake at the South Circular j/w Perry Vale. The hours of operation for SGN on these works are between 8.00-8.30 am start and the works finish at 4.30 pm daily.

We anticipate the A205 (south circular) part of the works to finish on 12 October 2010 and we anticipate the rest of the works to be complete by end of the first week in November 2010.

Should you wish to contact SGN regarding these works please contact them on 0845 026 0015 who will be happy to answer any questions regarding the works.

When I walk past at 7:55 each morning there is no sign of any activity about to start.