Motorised scooters/Go-peds

Questions:

• Can my child use their electric scooter/bike, quad, go-ped, mini-moto, hoverboard or Segway on the road or pavement?
• I have seen some electrically assisted pedal cycles advertised are they legal to use on the roads without insurance etc?
• Kids are driving up and down the road in motor cars and I don't think they are old enough to drive, can the police help?
• Local youths are riding up and down the street on go-peds / motorised scooters / mini-motos can the police do anything?
• There are always youths on bikes/ in cars screeching up and down the road, it is very dangerous, what can the police do?
• There are kids on go-peds / motorised scooters / mini motos on the pavement and it is very dangerous, what can the police do?
• There are kids on quad bikes/motorcycles riding up and down on the field near to where I live and it is very annoying - what can be done?
• What driving licence do I need to ride a Piaggio MP3?
• Where can electric scooter/bike, quad, go-ped, mini moto, hoverboard or Segway be used?