London's second-largest home after Buckingham Palace was struck by a heavily pregnant burglar who stole more than half a million pounds’ worth of jewellery by posing as a cleaner.

Prolific thief Luminita Zamfir, 24, told staff she had been sent by an agency for a trial shift and was escorted into a £105million mansion in central London.

Despite the home being under the protection of former elite Royal protection officers, Zamfir snatched £548,565 worth of rings, necklaces and earrings belonging to a wealthy international business family on February 5.

Zamfir also carried out two further heists, stealing more than £50,000 in watches, cufflinks and cash from the London homes of a property mogul and a property management boss.

She was snared through DNA evidence left on a tissue at one of the homes, and CCTV footage that caught her in the act.