I do ED to the Temple - between 25 and 30 minutes.  LL, Dog Kennel Hill (fun!), Denmark Hill, Camberwell, Walworth Road, E&C, Blackfriars Bridge.  The worst bit is the Walworth Road.  Never ending roadworks!  Agree with someone up-thread about terrible pot-holes.  Really some massive holes in the road on this route.  Combine them with oblivious pedestrians, crazy drivers and mad children cycling the wrong way round the E&C roundabout at night without any lights on, and you have the recipe for an interesting journey.  I've had one pedestrian collision - Walworth Road.  She hit the ground, got up, carried on running for her bus...