So how far up the road is it closed? Some reports say Waldenshaw, some say Sydenham Hill and some say Sydenham Rise?

If Waldenshaw is open, and accessible from London Road as Michael says, then why is the P4 diverted? It should just be able to run past the Horniman as usual since Honor Oak Road is further north than Waldenshaw. Can't quite see why it needs to divert up the hill?

rbmartin, fingers crossed it won't be too bad BUT there have been roadworks between Court Lane and Dulwich Library for the last week and I've found the traffic queues there surprising given that it's school holidays. I'd suggest it's probably worth allowing some extra time for any journeys involving that route until this is resolved.