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A bit out of date, but this interactive map of step free London is very good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 : National Rail South West
Accessibility friendly : Long and steep ramps to both platforms from separate entrances - gradient up to 1:5 on Platform 2 side, up to 1:8 on Platform 1 side.
General description : Thames Ditton is accessible to wheelchair users but owing to long steeply sloping footpaths, assistance may be required. Hampton Court and Surbiton either side of Thames Ditton are more accessible.
More comment : National Rail Map & Guide