London Mayor Boris Johnson has fined the United States 120 pounds in “congestion levies” from Obama’s motorcade during his state visit to Great Britain in May.

It’s the latest in a long-running feud between British officials and the U.S. embassy over previous fines.

The Standard reports that Obama’s personal armored Cadillac–nicknamed “The Beast”–first escaped a fine because congestion charge cameras were unable to record its license plate number.