shinyspokes
Guru
I don't commute into central London (wrong direction for me!) but noticed the comments about getting across the A3; this is my part of town, and there's a recently opened off-road but all tarmac cycle route from Elm Rd in New Malden that follows the railway under the A3 and into Raynes Park emerging in Taunton Ave - if you're continuing into Wimbledon town centre from there head through Raynes Park and along Worple Rd. Getting onto Wimbledon Common Southside (for Putney etc) does involve a climb but Southfields/ Earlsfield Wandsworth can be done on the flat too.