Sickening footage of scammers spitting at a man when he filmed them fleecing tourists on Westminster Bridge is the latest proof of the crime-wave gripping one of London's most iconic landmarks.

Swindlers tricking visitors into betting on impossible-to-win 'cup and ball' games have become a common sight on the bridge, which sits in the shadow of the Houses of Parliament.

Keen to expose the predators, a social media user filmed them - only to be shoved, abused and spat on.

Westminster Bridge has become notorious as a hotbed for lawbreakers of all forms, from pickpockets, bag thieves and unlicensed pedicab riders to illegal traders hawking hot nuts, ice cream and hotdogs.

Susan Hall, leader of the Conservatives in the London Assembly, told MailOnline: 'This is happening right under the nose of New Scotland Yard - which overlooks the bridge. You must ask yourself why the hell this is allowed to carry on.'