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LONDON, ENGLAND - JUNE 13: Princess Anne, Princess Royal unveils a commemorative plaque during her visit to The Postal Museum and Mail Rail for its ceremonial opening on June 13 in London, England. The Postal Museum and Mail Rail will open to the public on July 28, 2017. The Princess Royal explored the quirky history of the most royal of British institutions, the Royal Mail, and discovered the origins of the world's earliest social network; the post. (Photo by Miles Willis/Getty Images for The Postal Museum)

LONDON, ENGLAND - JUNE 13: Princess Anne, Princess Royal unveils a commemorative plaque during her visit to The Postal Museum and Mail Rail for its ceremonial opening on June 13 in London, England. The Postal Museum and Mail Rail will open to the public on July 28, 2017. The Princess Royal explored the quirky history of the most royal of British institutions, the Royal Mail, and discovered the origins of the world's earliest social network; the post. (Photo by Miles Willis/Getty Images for The Postal Museum)
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LONDON, ENGLAND - JUNE 13: Princess Anne, Princess Royal takes a ride on Mail Rail during her visit to The Postal Museum and Mail Rail for its ceremonial opening on June 13 in London, England. The Postal Museum and Mail Rail will open to the public on July 28 2017. The Princess Royal explored the quirky history of the most royal of British institutions, the Royal Mail, and discovered the origins of the world's earliest social network; the post. (Photo by Miles Willis/Getty Images for The Postal Museum)

LONDON, ENGLAND - JUNE 13: Princess Anne, Princess Royal takes a ride on Mail Rail during her visit to The Postal Museum and Mail Rail for its ceremonial opening on June 13 in London, England. The Postal Museum and Mail Rail will open to the public on July 28 2017. The Princess Royal explored the quirky history of the most royal of British institutions, the Royal Mail, and discovered the origins of the world's earliest social network; the post. (Photo by Miles Willis/Getty Images for The Postal Museum)
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LONDON, ENGLAND - JUNE 13: Princess Anne, Princess Royal tours the Mail Rail galleries during her visit to The Postal Museum and Mail Rail for its ceremonial opening on June 13 in London, England. The Postal Museum and Mail Rail will open to the public on July 28 2017. The Princess Royal explored the quirky history of the most royal of British institutions, the Royal Mail, and discovered the origins of the world's earliest social network; the post. (Photo by Miles Willis/Getty Images for The Postal Museum)

LONDON, ENGLAND - JUNE 13: Princess Anne, Princess Royal tours the Mail Rail galleries during her visit to The Postal Museum and Mail Rail for its ceremonial opening on June 13 in London, England. The Postal Museum and Mail Rail will open to the public on July 28 2017. The Princess Royal explored the quirky history of the most royal of British institutions, the Royal Mail, and discovered the origins of the world's earliest social network; the post. (Photo by Miles Willis/Getty Images for The Postal Museum)
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LONDON, ENGLAND - JUNE 13: Princess Anne, Princess Royal tours The Postal Museum during her visit for its ceremonial opening on June 13 in London, England. The Postal Museum and Mail Rail will open to the public on July 28, 2017. The Princess Royal explored the quirky history of the most royal of British institutions, the Royal Mail, and discovered the origins of the world's earliest social network; the post. (Photo by Miles Willis/Getty Images for The Postal Museum)

LONDON, ENGLAND - JUNE 13: Princess Anne, Princess Royal tours The Postal Museum during her visit for its ceremonial opening on June 13 in London, England. The Postal Museum and Mail Rail will open to the public on July 28, 2017. The Princess Royal explored the quirky history of the most royal of British institutions, the Royal Mail, and discovered the origins of the world's earliest social network; the post. (Photo by Miles Willis/Getty Images for The Postal Museum)
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Getty Images Entertainment Miles Willis

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LONDON, ENGLAND - JUNE 13: Princess Anne, Princess Royal tours The Postal Museum during her visit for its ceremonial opening on June 13 in London, England. The Postal Museum and Mail Rail will open to the public on July 28, 2017. The Princess Royal explored the quirky history of the most royal of British institutions, the Royal Mail, and discovered the origins of the world's earliest social network; the post. (Photo by Miles Willis/Getty Images for The Postal Museum)

LONDON, ENGLAND - JUNE 13: Princess Anne, Princess Royal tours The Postal Museum during her visit for its ceremonial opening on June 13 in London, England. The Postal Museum and Mail Rail will open to the public on July 28, 2017. The Princess Royal explored the quirky history of the most royal of British institutions, the Royal Mail, and discovered the origins of the world's earliest social network; the post. (Photo by Miles Willis/Getty Images for The Postal Museum)
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Getty Images Entertainment Miles Willis