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.
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Police are investigating whether a Land Rover Defender found burnt out in West Horsley was involved in Tuesday night's ram raid.
The work, called Gift Horse, replaces the giant blue cockerel that previously sat on the plinth.
50 of the country's worst pollution blackspots are in the capital. Many in places you may visit every day.