A moped gang behind a string of high profile raids are facing years behind bars.

The twelve defendants also caused outrage after they were caught on CCTV targeting a woman with a young child in broad daylight in Sandpits Road in Richmond.

They threatened to snatch the victim's three-year-old son unless she handed over her jewellery on June 21 last year.

One of the defendants, Isaac McFadyen, 19, told her: "Give me your rings. I'm going to hurt your child and take him away."

The panicked woman can be seen dragging her child into the road before builders chase the gang away brandishing scaffolding poles.

The footage went viral after being circulated on social media by Britain's Got Talent judge Amanda Holden, who asked the public to "call 101 or 999 if u know these scumbags".

Taking the gang off the streets has helped cut moped-enabled crime in the capital by 52% in the space of a year, the Met said.

The defendants, who are aged between 19 and 36, also used their mopeds to block traffic before taking an angle grinder to cameras rigged up to capture the boat race on March 22 last year.

Although their first attempt on Putney Bridge was interrupted by an off-duty police officer, a highly-specialised camera worth an estimated £170,000 and weighing 80kg was stolen from Lonsdale Road by Barnes Bridge.

The gang, who were all linked to ringleader Terry Marsh, 32, will be sentenced at Kingston Crown Court on Thursday for 20 offences including conspiracy to rob, conspiracy to burgle, conspiracy to steal, criminal damage and handling stolen goods.

Investigating officers said the gang were highly forensically aware and managed to carry out a number of raids without leaving any DNA evidence, forcing the police to painstakingly analyse huge volumes of mobile phone data to link the defendants and the offences.

Detective Sergeant Jonathan Payne said: "Following these arrests we've absolutely seen a reduction in moped-enabled crime and I personally see less bikes riding around areas where we've made the biggest impact such as a Fulham and Kensington."

"It's quite satisfying to us that when these defendants committed offences months earlier they thought they had got away with it, and now they're in the situation where they find themselves now."

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Omar Tafat, 22, of Fulham, admitted theft, going equipped to steal, criminal damage to a police car and breach of a criminal behaviour order, and was found guilty of two further counts of robbery and possession of an offensive weapon at trial.

Josh Strong-Myers, of Shepherds Bush, pleaded guilty to attempted theft, going equipped to steal, criminal damage to a police car, dangerous driving, driving whilst disqualified, possession of an offensive weapon and conspiracy to steal.

He was also found guilty of two further counts of robbery and possession of an offensive weapon at trial.

Kian Taylor, of no fixed address, admitted attempted theft, going equipped to steal, criminal damage to a police car, dangerous driving, driving whilst disqualified and possession of an offensive weapon, and was found guilty of robbery after trial.

Steven Weller, 36, of Ealing, admitted conspiracy to rob and conspiracy to burgle.

Marsh, of Fulham, pleaded guilty to conspiracy to rob, conspiracy to steal and conspiracy to burgle.

Ryan Moran, 26, of Fulham, admitted conspiracy to steal, conspiracy to burgle and handling stolen goods.

John McFadyen, 24, of Feltham, pleaded guilty to conspiracy to rob, while his brother Isaac admitted conspiracy to rob.

Mitchall Leaver, 25, of Battersea, admitted conspiracy to burgle. His twin brother Scott, of Lambeth, was found guilty of the same charge after trial.

Aaron Pask, 27, of White City, was convicted of conspiracy to burgle and conspiracy to steal, while Ram Monk 23, of no fixed address was found guilty of conspiracy to burgle.

They will all be sentenced at Kingston Crown Court later today.