The Prime Minister has tweeted a photo of himself meeting troops in Afghanistan.
David Cameron said: "It's been a privilege talking to the men and women serving Britain in Helmand on Armed Forces Day."
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Ursula Keogh, 11, went missing on Monday around 3.30pm. She was dressed in her school uniform.
"My sincerest apologies to everyone who purchased tickets and were planning to come to the upcoming shows."
His comments at the Defence and Security Forum on Monday came after a £20 billion black hole in the budget for the next decade emerged.