Quote from Lewisham Councils twitter feed regarding the apparently slow release of results:
"We have the smallest counting facility + we're 1 of only 4 London boroughs to elect a Mayor. It takes a lot longer."

I have a friend who is an election adjudicator and he was there at the count till well past 3am today. Turnout across the borough was quite high so it appears that the Labour Cllrs (and Green Party Cllr) elected have been given a pretty strong mandate by the local populace.
Perhaps the fact that Lewisham Council had the guts to take the fight for the hospital right to Jeremy Hunts door was a factor in making people decide to vote Labour (as the Lib Dem vote across the borough collapsed)? The threat to health services in Hammersmith & Fulham certainly contributed to the Labour win there.