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HENLEY-ON-THAMES, ENGLAND - JUNE 30: British Prime Minister Theresa May (C) and her husband Philip May (2nd R) leave the Stewards' Enclosure at the Henley Royal Regatta on June 30, 2017 in Henley-on-Thames, England. The five day Henley Royal Regatta is now in its 178th year. The event is one of the highlights of the English social season which sees international crews compete in knock out races along the River Thames. (Photo by Jack Taylor/Getty Images)

HENLEY-ON-THAMES, ENGLAND - JUNE 30: British Prime Minister Theresa May (C) and her husband Philip May (2nd R) leave the Stewards' Enclosure at the Henley Royal Regatta on June 30, 2017 in Henley-on-Thames, England. The five day Henley Royal Regatta is now in its 178th year. The event is one of the highlights of the English social season which sees international crews compete in knock out races along the River Thames. (Photo by Jack Taylor/Getty Images)

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HENLEY-ON-THAMES, ENGLAND - JUNE 30: British Prime Minister Theresa May (C) and her husband Philip May (2nd R) leave the Stewards' Enclosure at the Henley Royal Regatta on June 30, 2017 in Henley-on-Thames, England. The five day Henley Royal Regatta is now in its 178th year. The event is one of the highlights of the English social season which sees international crews compete in knock out races along the River Thames. (Photo by Jack Taylor/Getty Images)

HENLEY-ON-THAMES, ENGLAND - JUNE 30: British Prime Minister Theresa May (C) and her husband Philip May (2nd R) leave the Stewards' Enclosure at the Henley Royal Regatta on June 30, 2017 in Henley-on-Thames, England. The five day Henley Royal Regatta is now in its 178th year. The event is one of the highlights of the English social season which sees international crews compete in knock out races along the River Thames. (Photo by Jack Taylor/Getty Images)

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HENLEY-ON-THAMES, ENGLAND - JUNE 30: British Prime Minister Theresa May and her husband Philip May leave the Stewards' Enclosure at the Henley Royal Regatta on June 30, 2017 in Henley-on-Thames, England. The five day Henley Royal Regatta is now in its 178th year. The event is one of the highlights of the English social season which sees international crews compete in knock out races along the River Thames. (Photo by Jack Taylor/Getty Images)

HENLEY-ON-THAMES, ENGLAND - JUNE 30: British Prime Minister Theresa May and her husband Philip May leave the Stewards' Enclosure at the Henley Royal Regatta on June 30, 2017 in Henley-on-Thames, England. The five day Henley Royal Regatta is now in its 178th year. The event is one of the highlights of the English social season which sees international crews compete in knock out races along the River Thames. (Photo by Jack Taylor/Getty Images)