The only toll route I know of anywhere near London is the QE2 crossing, which is outside Greater London.
The CCZ (congestion charging zone) covers less than 5% of the Greater London area. There are plans to expand the CCZ, and tackle pollution via an ultra-low-emission-zone.
> "The Congestion Charge is an £11.50 daily charge for driving a vehicle within the charging zone between 07:00 and 18:00, Monday to Friday."