One does not appear amused... but Andrew is! The Queen seems focused on other matters as the Duke of York shares a joke with the King of Bahrain

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Her son Andrew might have shared a side-splitting moment with the King of Bahrain yesterday, but it appeared that on this occasion one was not amused.

The Queen’s attention seemed focused on other matters as the Duke of York talked to Hamad bin Isa Al Khalifa at the Royal Windsor Horse Show yesterday.

But despite looking a little glum, she had plenty to smile about at this year’s event, as her horse Barbers Shop won in two categories on Thursday.

Hamad bin Isa Al Khalifa, who became the King of Bahrain when the nation became a kingdom in 2002, joined the Royal Family on the third day of the five-day show held in the private grounds of Windsor Castle.

The Queen, 91, has attended annually since it began as a wartime fundraising event in 1943 and has even competed in the show herself.

Side-splitting: The Duke of York appeared to have discussed something highly amusing with Hamad bin Isa Al Khalifa, King of Bahrain at the Royal Windsor Horse Show

Unamused: The Queen didn't share in the laughter with her son and the Middle East royal

Good company: Former Prime Minister David Cameron stands next to the King of Bahrain at Friday's event 

Feminine blooms: The Queen opted for a delicate cream, green and blush pink number for the show

Ready for inspection: The royal cleans her glasses as she watches the Endurance event during the third day of the Royal Windsor Horse Show

In her element: The monarch looked in excellent spirits as she was shown one of the horses

Expert opinion: The monarch offered her views on the horses as they paraded past