Real horsepower meets 310PS in preparation for the Audi International match in Windsor Great Park

• 38mph speed limit at Guards Polo Club matches the maximum speed a horse can reach
• HRH Prince of Wales to present prestigious trophy
• Audi England team  will play Equus & Co USA Polo team for the prestigious Westchester Cup on Sunday, July 28
• Audi will sponsor the match for the second year in succession

The speed limit at Guards Polo Club in the stunning Windsor Great Park is a symbolic 38mph – the maximum speed of a horse – so it is probably the only place where the Audi A6 allroad quattro (pictured) with its 310 horsepower would find itself neck-and-neck with the real thing.

This royal venue plays host to the Audi International on Sunday 28 July 2013 at 3pm, and the public event is one of the highlights of the summer season, set to attract large crowds to witness England pit their wits against the USA for the prestigious Westchester Cup. Britain's proudest new grandfather, Prince Charles, will present the historic trophy to the winning team in what is the UK’s first staging of the Cup in 16 years.

Other VIPs due to attend the Audi International include Eddie Redmayne, Naomie Harris, Zoe Saldana, Angela Scanlon, Ophelia Lovibond, Tuppence Middleton and Alexandra Roach. Around 70 ‘very important ponies’, representing a total value of around £2.5 million, will also be present, some of which have been flown in especially from the US.

Prince Charles will hope to avoid the fate of his great grandfather King George V, who handed over the Westchester Cup to the American polo team following its win against England in 1921. The attached photograph from that year shows the cup being taken under police protection to Buckingham Palace where it was delivered to the King to present to the Americans.

The USA's win in 1921 levelled the Westchester Cup series 4-4.  Since then, the Americans have taken a 10-6 overall lead, though England have won the last two encounters in 1997 (when the Cup was last played on English soil) and 2009 (in Palm Beach, USA).

Since 1886 England have squared up to America a total of 16 times to claim the Westchester Cup, which is older than tennis’s Davis Cup by 14 years, and golf’s Ryder cup by 40 years.