Moped Accident and the Dopey 999 Operator

I witnessed an accident involving a girl of about 15 years being run over by a woman driving a moped. The girl ran out in the road between two buses and neither girl nor moped could do anything about the inevitable collision. I immediately called 999 and spoke to the ambulance operator. He could not locate the scene of the accident. I was on hold for about 4-5 minutes and luckily, someone else called the accident in. Later in the day I called up the London Ambulance Service and made a complaint. The girl, although in shock, managed to walk away. The woman on the moped was taken to hospital in a stretcher.