Two hundred years after the last Anglo-American war there is a growing concern in London that the US is once again picking a fight with the UK. In the space of a month, three of the UK's biggest banks have come under fire from US regulators.

First, Barclays was fined $450m for manipulating a key benchmark interest rate, then HSBC was accused by a Senate investigation of failing to prevent money-laundering at its Mexican subsidiary; now Standard Chartered has been called out for allegedly helping Iranian banks violate US sanctions and misleading US regulators.