The Prince and Princess of Wales could win the 'seal Royal approval' and bring the couple 'close to people of the country' if the England team wins at the Euros.
Royal butler Paul Burrell, who is speaking on the behalf of Slingo, says William will 'become the People's King' if he continues on current trajectory.
In a new interview, Paul says victory tomorrow night would also 'put Royal approval on the national football team' as he spoke of the connections between the Royal family and England's most popular sport.
He said: "I think England winning the Euros seals the Royal approval, and it puts royal approval on our national football team.
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