The Government Says

'...Seize assets held in the UK belonging to the US government equivalent to the value of the outstanding debt in respect of unpaid congestion charges incurred by their London embassy' -- L. Bigley

The government of the United States has repeatedly refused to pay the...

http://petitions.pm.gov.uk/USA-Ccharge/

seen at 20:52, 26 June in Number 10 E-Petitions - New Petitions.

TGS