Transport for London will send you a copy of the Step-free Tube guide, including the DLR and London Overground. This is very detailed – and useful, enabling people to make decisions about the practicality of using the underground. It is best used alongside the commentary in Access in London.
We include a simplified version of the step-free guide in the Getting around pdf for stations in the centre. Note that ‘accessible’ means step free from pavement to platform, and there may still be a step into the train itself.