From East Croydon Station to the A222, on to the A236 through Mitcham and on to the A217 up through Tooting and Earlsfield, onto the A3 at Wandsworth, then A205 through Putney & Sheen, right @ Clifford Avenue through Kew and on to Chiswick.
Reverse in the evening - bailing out and going to Clapham Junction instead of Croydon...
I ride a giant tcr composite 1 with ultegra gears as well as a giant talon 0 MTB, for a little challenge and fun I also have a spezallized langster single speed with a clickster freewheel hub.
If you don't have to many miles in London to commute then the langster is a great bike and would be the one I would choose