German chancellor Angela Merkel met the Queen at Buckingham Palace this afternoon.
"You've had a very busy day," the Queen said.
"Yes but it's my duty to have busy days," Mrs Merkel replied.
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The 270 victims of the Lockerbie bombing have been remembered today, 26 years to the day that they lost their lives in the air disaster.
Actress Billie Whitelaw, who starred in films including The Omen, has died aged 82.
Scotland's top prosecutor and an FBI director met to discuss the progress of further investigations into the Lockerbie bombing.