I don't visit London, have no idea how these charges work, so where do the government ministerial cars fit into this charging?
Whilst I'm at it how do they justify a convoy of gas guzzlers going the very short distance from Downing Street to the Palace of Westminster (House of Commons) There is a secure walkway that can be used, plus they could practise what they are preaching. Use environmentally friendly cars. The few examples they do have are used very infrequently by the most junior of minions and then it is generally a staged publicity stunt.
As Andy says, we get the government we deserve. The country or London voted, they and we are now paying the price of being part of a democracy.
John