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A bit out of date, but this interactive map of step free London is very good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 :
Chingford is on the London Overground, and deemed entirely accessible. See pictures and further accessible transport in London detail from links below.
National Rail : London Overground
AccessAble Access Guide :
Accessibility friendly : The whole station is entirely accessible, and boarding ramps are also available.
General description : See wiki
More comment : National Rail map & guide