Thought I would post this as a lot of people don't realise it, not only is congestion charge free, you can also park for free in Westminster
Combustion engine drivers have to pay £10 for 2 hours, or £24 for Q Parking! so this is a nice saving if you are visiting London in an EV.....
You are dependant on traffic wardens realising you are driving an EV so might be prudent to leave a note in your screen to say your car is an EV
IMPORTANT NOTE: Especially for Congestion Charging in London, please be aware that Hybrid refers to plug-in Hybrid vehicles (PHEV) not non-plug ins.
In any case for CC exemptions, you need to register Annually for a cost of £10 Registration Fee.