It was a family affair today as Prince Harry showed the Queen around his charity Sentebale's garden at the Chelsea Flower Show.
The prince welcomed his grandmother into the garden moments after also giving the Prince of Wales, Duchess of Cornwall and Duke of Edinburgh a guided tour.
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The NHS said errors were extremely rare and it was vital they are investigated when they happen.
The piece will go on public display at Sotheby's in London, a mile away from the Palace of Westminster, from September 28 to October 3.
The London Fire Brigade has been interviewed under caution by police investigating the Grenfell Tower fire.