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A bit out of date, but this interactive map of step free London is very good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 : Victoria, Northern
I visited warren street station on the Northern line in June 2019, and the station is highly inaccessible. There are a number of stairs, and an escalator, which is OK for most of us. I made some written notes which suggested there are two long elevators, and then a set of stairs.
Warren street station - June 2019
Accessibility friendly : Warren Street is NOT accessible to wheelchair users due to escalators between the platform and street level.
Warren street step from platform - June 2019
Warren street stairs from platform - June 2019