The organisation "London Councils" - which represents the boroughs - says charges are determined by the demand for parking spaces.
But critics claim they just add to the burden on already hard-pressed Londoners.
Our Political Correspondent Simon Harris reports:
More top news
A Labour MP tipped as a possible candidate for London mayor has admitted crashing into a motorcylist her second accident in just over a year
The 48-year-old man was held on suspicion of theft from heritage and protected sites.
A Met Police officer was left red-faced after attempting to stop a cyclist riding along a dedicated cycle path.