Yes, children are permitted in London black cabs, and they are unique because they are often exempt from standard car seat laws. Under UK law, if a licensed taxi or private hire vehicle does not have a child car seat available, a child under 3 years old can travel unrestrained in the rear seat. For children aged 3 and over, they must use the adult seat belt if a car seat is not provided. This exception exists for practical reasons, as it is difficult for taxi drivers to carry multiple sizes of car seats for every passenger. However, for safety, parents are always encouraged to bring their own portable seat or "ISOFIX" compatible carrier if possible, as black cabs are equipped with standard seat belts. The spacious, rear-facing "jump seats" in a black cab are also popular for families, but remember that the driver is legally responsible for ensuring children under 14 are properly restrained according to these specific taxi exemptions.