The Duchess of Cambridge, who is eight months pregnant, was all smiles at the Trooping the Colour parade - her last public engagement before she gives birth in mid-July.
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One person has been confirmed dead and several are injured in the ongoing incident in Las Ramblas.
A number of fatalities and several injuries have been reported after a van has crashed into people in the Ramblas area of Barcelona.
John Underhill said geological changes 55 million years ago mean the UK's geology is unsuitable for shale oil and gas production.