Hopefully someone can link this for me as I'm rubbish at them. It's from today's daily mirror.
It just said that an ambulance and crew had visited the nursery to talk about their work when the parked ambulance rolled backed and crushed the 2yr old to death. 
Don't have many more details as I just skimmed the story at the kiosk in tescos. The worse bit I read was when a neighbour to the nursery said she heard the mother screaming 'where's my little boy?'

Seemed the ambulance was parked on a slope.