I cycle from Camberwell to Willesden Junction. From Willesden I follow the Canal Way down to Paddington, cut into Hyde Park (favourite part of the ride) and across to and past Victoria Station (I change this bit a lot and still haven't really found the best route to miss all the traffic), down to and over Vauxhall Bridge, past the Oval and then I usually go various different back streets towards Denmark Hill. When I was really fit - I could do it in about 1hr 10mins but at the moment (after having a baby and not riding this far for about a year) I'm doing it in about 1 1/2 hours. Same time as the tube - phah - I hate peak hour public transport. When I'm feeling lazy I catch the overland from Willesden Junction to Clapham Junction and ride back from there. I can do that in 20 minutes. Door to door in an hour. Love it.