Players have a ball at the Palace
The hallowed turf of Buckingham Palace has staged its first football match and luckily for the Queen there was not a broken window in sight.
The Duke of Cambridge, who organised the competitive game between two of England's oldest amateur clubs, had warned the players anyone smashing a pane would answer to his grandmother.
During the day William, president of the Football Association, donned his boots - a present from England striker Wayne Rooney and embossed with WR10 - but not for the match, instead he joined the Queen's Household team for a training session.
The Civil Service FC and Polytechnic FC match was a hard fought encounter in bright autumn sunshine that did much to raise the standing of the Southern Amateur League's senior division one where the teams play.
And at half time the players were amazed to see their traditional refreshments of water, orange segments and Mars bars served on silver-plated platters by Palace footmen and women wearing their uniforms of tail coats and scarlet waistcoats.
Sandy Smith, a 27-year-old strategy consultant living in London, was captain of Polytechnic FC who won two goals to one.
He said: "I think the day was summed up by the weather - it's been perfect.
"For the first five minutes everybody had nerves and were making passes they wouldn't be too proud of but once we got into it we forgot about the spectators and played football.
" There were a few words that perhaps people aren't used to hearing at the Palace - for the most part we toned it down - but I'm glad we didn't break any windows.
"It's a shame William didn't put his boots on till later, we had a bit of football chat and banter that showed he knew his football."
Civil Service FC is the sole surviving club out of the 11 which founded the FA in the Freemasons' Tavern in Great Queen Street, London, in 1863 and later drafted the 13 original laws of association football. Polytechnic FC was formed in 1875.
Before kick-off, William met match referee Howard Webb, one of the country's best-known football officials, who has taken charge of World Cup and Champions League finals and the recent Premier League Manchester derby match.
The Duke was joined during the day by former England striker Michael Owen and FA chairman Greg Dyke.
The Queen's garden lawn is more used to being trodden by garden party guests in their smart shoes and stiletto heels than footballers with their boots.
But the grass, which had been re-seeded in parts after a busy summer of events, held up well to the sliding tackles.
There was also friendly banter between some of the supporters and the referee Mr Webb, with one spectator shouting at the official, who has a shaved head: "Get the hair out of your eyes, ref."
The Civil Service team presented William with two tiny tops for his son, Prince George - one red and the other white, both with "HRH 1" on the back.
Earlier in the day William hosted a Palace reception where 150 hard-working football volunteers were presented with medals for their efforts, part of the FA's 150th anniversary celebrations.
The Duke told the guests: "At its best, football is a powerful force for good in society. It binds people from different backgrounds, communities, faiths and abilities - and gives them a common interest, a unifying identity.
"I believe, over its 150 years, football has remained a wonderful example of the power of community and of our ability to come together to organise and to enjoy a simple pastime."
Speaking about the Queen, he added: "One warning, though: if anyone breaks a window, you can answer to her."
Summing up the day, Mr Dyke said: "It's wonderful, bringing all these hundreds of volunteers from all over the country to Buckingham Palace to celebrate football - celebrate what they do.
"Luckily the weather's been good and it hasn't been raining so we did not rip up the lawn. The Duke was concerned that the lawn might suffer but it's OK.
"It did help having the Duke of Cambridge as your president. He said his grandmother was very happy as long as we didn't break any windows."