CCTV released by Westminster Council shows the moment an innocent shopper is targeted by a fraudster on Oxford Street.
A gang member can be seen bending down to pick up a ring - but in this case the target gets away without falling for it, after a warning from a council binman.
More top news
The Local Government Association has said the Government should introduce a database which lists which electrical goods have been recalled.
New exhibit showcases how London could look very different in the future
Mayor Sadiq Khan is aiming to get 40 per cent of Tube stations to be step-free by 2022.