Search london history from Roman times to modern day
A bit out of date, but this interactive map of step free London is very good
All the London railway stations :
Underground lines : Piccadilly, Metropolitan
AccessAble Access Guide :
Accessibility friendly : Metropolitan line (A step 277-290mm/ gap 40-60mm). Piccadilly line (B step 127 - 140mm / gap 84 - 104 mm).
There is level access between the street and platforms.
General description :