Canoe slalom gold medallists Etienne Stott and Tim Baillie are making an appearance at the Lee Valley White Water Centre.
The centre is the first London 2012 venue to open to the public after the Games.
Plans have been unveiled for a £4.5 million development of the centre starting in January 2013.
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The footage was apparently shot in south London showing a motorist eating a bowl of cereal, and texting whilst sitting in traffic.
The Prime Minister is trying to curb the money laundering that goes on at the highest ends of the London property market.
The average increase across the capital is 9.2% this year - with areas in the east and south of the city up by 15-16%.