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CRATHIE, SCOTLAND - SEPTEMBER 18: Prince Charles, Duke of Rothesay, drives from Crathie Church on September 18, 2016 in Crathie, Scotland. Prime Minister Theresa May has spent the weekend in Scotland for her first audience with the Queen at Balmoral as Prime Minister. (Photo by Jeff J Mitchell/Getty Images)

CRATHIE, SCOTLAND - SEPTEMBER 18:  Prince Charles, Duke of Rothesay, drives from Crathie Church on September 18, 2016 in Crathie, Scotland. Prime Minister Theresa May has spent the weekend in Scotland for her first audience with the Queen at Balmoral as Prime Minister. (Photo by Jeff J Mitchell/Getty Images)