LONDON, ENGLAND - OCTOBER 12: Princess Eugenie arrives to meet The Very Reverend Dr John Hall Dean of Westminster to attend a service to commemorate the work of William Wilberforce and mark the United Kingdom's commitment to combat modern slavery at Westminster Abbey on October 12, 2016 in London, England. (Photo by Chris Radburn - WPA Pool/Getty Images)

LONDON, ENGLAND - OCTOBER 12:  Princess Eugenie arrives to meet The Very Reverend Dr John Hall Dean of Westminster  to attend a service to commemorate the work of William Wilberforce and mark the United Kingdom's commitment to combat modern slavery at Westminster Abbey on October 12, 2016  in London, England. (Photo by Chris Radburn - WPA Pool/Getty Images)