The Duke and Duchess of Cambridge and their son have arrived at the Middleton family home in Bucklebury.
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The raiders drove a van into the front of the high-end store in west London, police said.
It shows a child clutching an Extinction Rebellion sign while crouching near a plant shoot emerging from the earth.
It comes as the board for the multi-billion pound Crossrail project finally announced a potential opening date for the rail line.