Olympic chiefs were duped into paying �2.3m to a gang of con-men who posed as an official contractor, Southwark Crown Court heard last week.

Posing as Skanska, one of the leading builders at Stratford’s 2012 Park, they rang the Olympic Delivery Authority with a “new” bank account number and received payments earmarked for the authentic company.

Sierra Leaonean Ansmana Kamara, 31, was jailed for three years and six months after being convicted of money laundering.