Lloyds and Santander accused of providing accounts for Iranian front companies

Both banks deny helping Tehran-controlled oil firm PCC to move money in breach of sanctions

Two of the UK's largest lenders, Santander UK and Lloyds Banking Group, allegedly held bank accounts for front companies that helped Iranian entities evade US sanctions, according to reports.

The news has rattled investors, who sold off shares in the two banks on Monday morning, amid fears that the lenders could face penalties if they are found to have in any way assisted Iran's state-controlled Petrochemical Commercial Company (PCC).