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The tide waits for no-one – and neither does the pressure! Our final four teams of sandy dreamers hit the Scottish shores of St Andrews for their toughest challenge yet: Sky’s the Limit. Their brief is to build big, with towering sculptures that defy gravity and the incoming waves.

With drama, collapses and plenty of sand-fuelled fun as the clock ticks down from yellow flag to red, who will soar into the final, and who will crumble under the weight of their own ambition?