Haven't had much luck as it always seems to be school run or time to feed the baby!
Have spoken to them again now and they are sending someone out today to Overhill Road. It's tricky as obviously the dog may have stopped barking by then (which is what happened last time).
The phone number for the noise team (24 hours/day and they should respond quickly) is 0207 525 5777 and the email address is EnvironmentalCustom@southwark.gov.uk
if anyone else can call when the dog is actually barking...it may help that it's not jut one person being disturbed.
Am going to put a note through their door too as they may be unaware their dog barks all day