The success of the charge has been hailed in the London mayor's report on its first anniversary, which claims it has contributed£50m to the city's economy.
But the Commission for Integrated Transport said the mayor's independent status had been an advantage, and questioned whether a political party would allow one of its representatives to impose such a controversial measure.
London's four-year election cycle had given Mr Livingstone a clear period to develop the charge, a spokesman added.
Another factor in London's favour was its lack of competition.
'Elsewhere, if city A imposed a charge, shoppers might simply vote with their feet and go to neighbouring city B,' the spokesman said.
Apart from a very small scheme in Durham, only City of Edinburgh Council has well-advanced charging plans, and it is a year away from a planned referendum.
It has published a plan for a charge zone, which will go to public inquiry in April.
Nottingham City Council hopes to be the first to impose workplace parking charges. The city's first tram is due to open on 9 March in an effort to cut car use.