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Queen is Britain's longest-reigning monarch

The Queen has thanked people from around the world for their "touching messages of great kindness" on the day she becomes Britain's longest-reigning monarch.

Her Majesty will have served for 63 years and seven months - approximately 23,226 days, 16 hours and approximately 30 minutes - by around 5.30pm today, overtaking the previous record held by Queen Victoria.

She told well-wishers in the Scottish town of Tweedbank that it was not a milestone she had never aspired to but that she was "very grateful" for the messages of support.

Earlier, David Cameron told the Commons that her reign had been "a golden thread running through three post-war generations".

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Harman pays tribute to Queen's 'tireless' commitment

Acting Labour leader Harriet Harman said the Queen is "admired by billions of people all around the world" in a tribute to her in the House of Commons.

Ms Harman praised Her Majesty's "tireless" commitment and dedication to the service of her country.

She also joked that the Queen had "gone from sending telegrams to sending tweets".

"We send her out warmest congratulations, our appreciation and above all our thanks," said Ms Harman.

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