If the leader of the free world asked to play through you during a round of golf, what would you do?

That was the dilemma facing Aaron Bell, from Thames Ditton, when he and two colleagues bumped into US President Barack Obama along with Prime Minister David Cameron, during a leisurely round at the exclusive Grove club.

The group let the pair, and their entourage, pass but made sure to ask who was winning and grab a photo opportunity.

The surprise request came as Mr Obama relaxed at the Watford course during the third day of his UK tour - a day after he urged Britain to stay in the EU.

Mr Bell, 45, said: “At each tee our group was closely followed by a very amiable security detail of bomb disposal, special forces, police snipers and US agents in suits and dark glasses.

“They asked us if we would let them play through as they had to get off quite quickly, as they were going to the Queen's birthday.

“Obama came over and thanked us for letting them play through, they stopped, had a little bit of banter.

“We were allowed to stand on the tee and watch them tee off. Barack has a nice smooth swing and David got away nicely with a textbook swing.

“Although David Cameron was a little bit politically correct, and went slightly right on his drive.

“I said to David that I heard that he three putted the fourth and he said that he parred the first hole and possibly should've given up after that.

“Barack Obama had put his arm around him and said he was playing well, so I think Barack Obama won.”

Mr Bell, of Weston Green Road, realised something unusual was happening on the course when browsing in the shop.

He said: "I saw this guy come in and he asked if we sold sunglasses - he thought I worked there. He said without sunglasses he would find it difficult to do his job.

"I lent him my sunglasses."

Mr Bell, who works for creative consultancy Radley Yeldar and was with his colleagues on an annual golf day, said the encounter was “completely unexpected”.