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A bit out of date, but this interactive map of step free London is very good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 :
National Rail : National Rail Southern
AccessAble Access Guide :
Accessibility friendly : There is no step-free access to Ticket Office and platforms. Step-free interchange available between platforms. Nearest step-free station is London Bridge.
General description : See wiki
More comment : National Rail Map & Guide.