LONDON, ENGLAND - MARCH 11: Catherine, Duchess of Cambridge talks with pupils as she visits School 21 in Stratford on March 11, 2021 in London, England. The Duke and Duchess of Cambridge visited the school in east London to congratulate teachers involved in the re-opening of the school following lockdown restrictions. (Photo by Justin Tallis - WPA Pool/Getty Images)
LONDON, ENGLAND - MARCH 11: A young pupil holds up five fingers to show his age as Catherine, Duchess of Cambridge visits School 21 in Stratford on March 11, 2021 in London, England. The Duke and Duchess of Cambridge visited the school in east London to congratulate teachers involved in the re-opening of the school following lockdown restrictions. (Photo by Justin Tallis - WPA Pool/Getty Images)
LONDON, ENGLAND - MARCH 11: Catherine, Duchess of Cambridge speaks to a young pupil in the playground during a visit to School 21 in Stratford on March 11, 2021 in London, England. The Duke and Duchess of Cambridge visited the school in east London to congratulate teachers involved in the re-opening of the school following lockdown restrictions. (Photo by Justin Tallis - WPA Pool/Getty Images)
LONDON, ENGLAND - MARCH 11: Prince William, Duke of Cambridge, speaks to a young pupil in the playground during a visit to School 21 in Stratford on March 11, 2021 in London, England. The Duke and Duchess of Cambridge visited the school in east London to congratulate teachers involved in the re-opening of the school following lockdown restrictions. (Photo by Justin Tallis - WPA Pool/Getty Images)
LONDON, ENGLAND - MARCH 11: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a discussion with teachers and mental health professionals during a visit to School 21 in Stratford on March 11, 2021 in London, England. The Duke and Duchess of Cambridge visited the school in east London to congratulate teachers involved in the re-opening of the school following lockdown restrictions. (Photo by Justin Tallis - WPA Pool/Getty Images)