If one wanted to park his car for free on the street and visit London's city center, what would be the closest/most accessible place to do so? For the sake of the question, let's assume that the centre of London is Charing Cross, Westminster.
The parking spot has to be free of any kinds of restrictions (e.g. only free on certain days) and has to be available to non-residents. Obviously parking in Central London itself would never be free, but surely there is free parking somewhere within a 20km radius from the downtown area?
