Plans of MI6 building 'lost during renovation work'

Plans of the MI6 headquarters, including the building's security measures, have been 'lost' during renovation works.

The alarm was raised around two weeks ago after more than 100 documents were lost during recent refurbishment work at the headquarters of Britain’s Secret Intelligence Service, better known as MI6.

Construction giant Balfour Beatty has been sacked from renovating the London site after the blunder.

Security officials searched the site as those with access to the documents were questioned in a separate part of the headquarters. Although some documents were later found inside the building on London’s south bank, some are still unaccounted for, according to The Sun.

The plans, said to show internal floor plans of the building and location of security alarms, are understood to have been held in a secure room to which only around 40 contractors had access.