According to BBC:
The Duke of Cambridge was one of several people to help the Queen’s representative in Essex when he appeared to slip and fall on a wet pavement.
Jonathan Douglas-Hughes, Vice Lord-Lieutenant of Essex, was introducing Prince William to local dignitaries in Harlow when he slipped outside the Stewards Academy school.
A gasp went up from about 30 well-wishers as he landed on his back and he was helped to his feet by William and others.
Mr Douglas-Hughes turned to William and said “Sorry about that”, and the Duke replied “No, it’s all right.”
