Far more than just road charging, but many schemes to improve public transport making it more attractive and easier to use, while reducing pollution
http://www.fleetnews.co.uk/news/environment/2017/06/21/mayor-wants-zero-emission-zone-in-central-london-by-2025
Need to wait until tomorrow when the proposals are released in full.
The main point of interest will be the area covered by the proposals in terms of mile charging, is the whole of London or an inner area only like the congestion charge, as well as the proposed charges.