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A bit out of date, but this interactive map of step free London is very good
All the London railway stations :
Underground lines : District
AccessAble Access Guide :
Accessibility friendly : Eastbound towards Earl’s Court (A step 187-197mm/gap 0-27mm). Westbound towards Wimbledon (A step 223-233mm/gap 17-53mm).
There is now lift access between street and platform.
General description : Southfields station has a newly
installed, high capacity lift and District line services are step-free from
street to platform, but there is a large step between the platform and the
trains. With the use of manual boarding ramps at Southfields station platforms
during Games time District line services will be step-free.