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HARLOW, ENGLAND - SEPTEMBER 16: Vice Lord Lieutenant of Essex Jonathon Douglas-Hughes falls over a bollard during Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit of Stewards Academy with HeadsTogether on September 16, 2016 in Harlow, England. (Photo by Karwai Tang/WireImage)

HARLOW, ENGLAND - SEPTEMBER 16:  Vice Lord Lieutenant of Essex Jonathon Douglas-Hughes falls over a bollard during Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit of Stewards Academy with HeadsTogether on September 16, 2016 in Harlow, England.  (Photo by Karwai Tang/WireImage)

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HARLOW, ENGLAND - SEPTEMBER 16: Catherine, Duchess of Cambridge looks on as Prince William, Duke of Cambridge rushes to helpVice Lord Lieutenant of Essex Jonathon Douglas-Hughes who fell backwards over a bollard as they arrive at Steward's Academy on September 16, 2016 in Harlow, England. The Duke and Duchess of Cambridge are visiting Steward's Academy as part of their Heads Together campaign, The Duke and Duchess of Cambridge will visit Stewards Academy in Harlow, Essex, to find out more about the pressures faced by young people when they are going through big changes in their lives, and learn about the support from peers and parents that can help them get through these changes. (Photo by Chris Jackson/Getty Images)

HARLOW, ENGLAND - SEPTEMBER 16:  Catherine, Duchess of Cambridge looks on as Prince William, Duke of Cambridge rushes to helpVice Lord Lieutenant of Essex Jonathon Douglas-Hughes who fell backwards over a bollard as they arrive at Steward's Academy on September 16, 2016 in Harlow, England. The Duke and Duchess of Cambridge are visiting Steward's Academy as part of their Heads Together campaign, The Duke and Duchess of Cambridge will visit Stewards Academy in Harlow, Essex, to find out more about the pressures faced by young people when they are going through big changes in their lives, and learn about the support from peers and parents that can help them get through these changes.  (Photo by Chris Jackson/Getty Images)

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HARLOW, ENGLAND - SEPTEMBER 16: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge check on Vice Lord Lieutenant of Essex Jonathon Douglas-Hughes after he fell over a bollard during the visit of Stewards Academy with HeadsTogether on September 16, 2016 in Harlow, England. (Photo by Karwai Tang/WireImage)

HARLOW, ENGLAND - SEPTEMBER 16:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge check on Vice Lord Lieutenant of Essex Jonathon Douglas-Hughes after he fell over a bollard during the visit of Stewards Academy with HeadsTogether on September 16, 2016 in Harlow, England.  (Photo by Karwai Tang/WireImage)

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HARLOW, ENGLAND - SEPTEMBER 16: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge chats with Vice Lord Lieutenant of Essex Jonathon Douglas-Hughes during the visit of Stewards Academy with HeadsTogether on September 16, 2016 in Harlow, England. (Photo by Karwai Tang/WireImage)

HARLOW, ENGLAND - SEPTEMBER 16:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge chats with Vice Lord Lieutenant of Essex Jonathon Douglas-Hughes during the visit of Stewards Academy with HeadsTogether on September 16, 2016 in Harlow, England.  (Photo by Karwai Tang/WireImage)

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HARLOW, ENGLAND - SEPTEMBER 16: Catherine, Duchess of Cambridge looks on as Prince William, Duke of Cambridge helps Vice Lord Lieutenant of Essex Jonathan Douglas-Hughes who fell backwards over a bollard as they arrive at Steward's Academy on September 16, 2016 in Harlow, England. The Duke and Duchess of Cambridge are visiting Steward's Academy as part of their Heads Together campaign, The Duke and Duchess of Cambridge will visit Stewards Academy in Harlow, Essex, to find out more about the pressures faced by young people when they are going through big changes in their lives, and learn about the support from peers and parents that can help them get through these changes. (Photo by Chris Jackson/Getty Images)

HARLOW, ENGLAND - SEPTEMBER 16:  Catherine, Duchess of Cambridge looks on as Prince William, Duke of Cambridge helps Vice Lord Lieutenant of Essex Jonathan Douglas-Hughes who fell backwards over a bollard as they arrive at Steward's Academy on September 16, 2016 in Harlow, England. The Duke and Duchess of Cambridge are visiting Steward's Academy as part of their Heads Together campaign, The Duke and Duchess of Cambridge will visit Stewards Academy in Harlow, Essex, to find out more about the pressures faced by young people when they are going through big changes in their lives, and learn about the support from peers and parents that can help them get through these changes.  (Photo by Chris Jackson/Getty Images)