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TV star Ross Kemp took centre stage at the 11th annual Gravity Grand Prix (GGP) in Cookham Dean at the weekend, which organisers said saw the largest number of karts ever.

A giant butter tub, Lego blocks car and Donald Trump effigy were among 33 quirky designs to race down Church Road on Sunday at the event.

Organised by the Kaffirs of Cookham Dean, the event sees racers whizzing down the racecourse in homemade karts driven just by gravity, in aid of charity, as thousands of spectators watch.

Since it started in 2007, the Gravity Grand Prix has raised more than £100,000 for Thames Valley Air Ambulance – last year crowds helped raise £15,000 and organisers are hoping to raise a similar amount this year.

Paul Webb, of the GGP organising committee, said the day was “very successful” with large crowds coming to watch despite the “threatening weather”.

Mr Kemp, who lives in Cookham Dean, helped push some of the slower karts at the start and presented the prizes to a “damp but cheerful” crowd at 4.45pm.

Race controller and treasurer Peter Austen said: “We anticipate that our income will be 15 to 20 per cent down on last year due to the weather but still hope to make our target of £15,000 when all the sponsorship has been received. 

“We would like to thank everyone for supporting us yet again and enabling a fun filled day.”