Dai Davies, the former head of royal protection for the Metropolitan Police, says accidents like these are embarrassing for the service, but that training for officers is very rigorous.
More top news
A mother from Cardiff has held a fundraising event to help keep the memory of her stillborn son alive.
We featured the story of Ted Owens' heroism in 2012 when he returned to the spot where he was wounded during the Normandy landings.
Sunny spells during the evening with isolated showers easing away, although it will cool off quite quickly.