Queen Elizabeth II and the Duke of Edinburgh attended the fifth and final day of Royal Ascot in Berkshire today, presenting the winning cup to the owner of Slade Power ridden by Wayne Lordan after winning the Diamond Jubilee Stakes.
The catering at Ascot Racecourse, which hosts Royal Ascot - attended each year by the Queen - is run by Sodexo Prestige, according to the firm's website.
The company won four awards in last year's National Racecourse Catering Awards for its food.
A Sodexo spokeswoman would not confirm which of its sites had been supplied with the frozen products.
She also declined to name the supplier of the beef products which tested positive for horse DNA and would not say if it was a British or Irish manufacturer.
Sodexo describes itself as "the UK's largest event caterer and provider of corporate hospitality packages".
Four men have been arrested on suspicion of attempted murder after a man was run over following an argument at a pub.
A 24-year-old was hit by a Volkswagen Golf R32 as he was walking near to the Esso Garage in Ascot, Berkshire, in the early hours of this morning.
He was rushed to hospital and is in a critical condition.
Four men are in police custody.
– Thames Valley Police spokesman
"Although we are in the early stages of the investigation, we believe that the injured man was possibly involved in a previous altercation at the Club One pub with a group of other men. It is vital that anyone who was in the area at the time and saw the collision, or the man in the club prior to this and has information to help us with our investigation, comes forward and speaks to the police."
The High Street in Ascot was closed following the incident at 3.20am as the police carried out their investigation.
The road is expected to be closed for several hours.
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Royal Ascot is welcoming the Queen for a week of horse racing that will attract around 300,000 race goers to the famous sporting and social event over the coming days. The Queen regularly attends the horse racing meet, which is held over five days.
Each afternoon the Queen travels up the course in a carriage procession with the Duke of Edinburgh, members of the Royal Family and guests. This year Royal Ascot has honoured the Queen by re-naming a race to mark the monarch's 60-year reign.
The Diamond, formerly Golden, Jubilee Stakes, will be run on Saturday - the last day of the sporting event. A passionate horse breeder and owner, the Queen has entered one of her thoroughbreds, Carlton House, for the Prince of Wales Stakes being staged at the meet.