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A bit out of date, but this interactive map of step free London is very good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 :
Morden station is on the Northern line. And in google maps shows clearly there are a number of buses which serve the station immediately outside.
Morden station on the Northern line
Morden station is Step free with a raised platform at a specific part of the platform
Morden station lift example from platform to street level
Accessible Access : There is lift access between the street and platforms. I need pictures of these and the steps onto the trains.
Accessibility friendly : (A step 140-173mm/gap 0-33mm).
General description : Step size makes this station more awkward for wheelchair access. Actually, a designated part of the station has a raised level platform which gives easier egress (exit) and entrance onto the trains.
More comment : Why anyone would want to enter the Northern line in a wheelchair is beyond me. I travelled to every station from Morden to Charing Cross today, and clocked up 40 flights of stairs in this journey, that excludes the very long elevators and one lift, which was only reached via extensive sets of stairs! (June 2019).