Mayor Boris Johnson plans to confront President Obama over millions of pounds owed by the US embassy in congestion charges, during his visit to London.
Several embassies refuse to pay the charge for driving in central London, claiming they are exempted from local taxes. The total bill stands at ã51m.
Maybe when President Obama's hors d'oeuvre plate is whisked away he will find a bill for ã5.5m, he said.
The US embassy said it considered the charge to be a direct tax.
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