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The Diana Princess of Wales Memorial Fountain in Hyde Park is designed by American architect Kathryn Gustafson, cost �3.6m and is based on an 80m x 50m oval stone ring.

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The crowds arrived from early morning and most said they thought the fountain to be a fitting tribute to the princess.

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The Queen gave a speech in which she said: "I remember especially the happiness she gave my two grandsons."

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The event brought the Windsors and the Spencers together for the first time since the princess's funeral in 1997, when Earl Spencer appeared to criticise the Windsors.

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Diana's two families mixed comfortably with each other and Earl Spencer played down talk of a rift by saying: "There wasn't really one that needed healing."

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Etched on the inner side of the fountain is the inscription: "Diana Princess of Wales Memorial Fountain opened by her Majesty The Queen on 6th July 2004."

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The princess's god-daughter Domenica Monckton (left) and sister Savannah played with the water.

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Other youngsters went a step further and took the plunge to splash around in blazing sunshine.

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People travelled from across the UK to attend the ceremony and some had a better view than others.

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Their wait was rewarded when after the official ceremony, Prince William and the other Windsors met onlookers.