Most child car seat guidance is written for parents. This is written for the people who drive them for work - the taxi and private hire trade, minibus and coach operators, and the company car or van driver whose vehicle occasionally carries a child. The rules are more detailed than “kids need a car seat”, and the detail is where the £500 fine lives.
Children must normally use a child car seat until they are 12 years old or 135 centimetres tall, whichever comes first. After that - 12 or 13, or younger but over 135cm - they must wear a seat belt. The driver must make sure children in the vehicle are correctly restrained, and can be fined up to £500 if a child under 14 is not in the correct seat or belt. The legal responsibility in a moving vehicle sits with whoever is driving it, which is exactly why this belongs in a fleet handbook and not just a parenting guide.
Seats are chosen by height or weight, and only approved seats are legal in the UK:
A child car seat may only be used if the vehicle’s seat belt has a diagonal strap - unless the seat is designed for a lap belt or fits with ISOFIX anchor points. Front airbags must be deactivated before a rear-facing baby seat goes in a front seat, a rule that matters in vans where the front may be the only option. And child car seats must never be fitted in side-facing seats - relevant to some crew-cab and minibus layouts.
The same rules apply to children with disabilities or medical conditions, but they can use a disabled person’s seat belt or a child restraint designed for their needs. Where a child’s condition means they genuinely cannot use a restraint or seat belt, a doctor can issue an exemption certificate. Operators running accessible transport should treat that certificate the way the seat belt medical exemption works: issued by a doctor, carried on the journey, and on file.
Taxi and private hire operators should brief the rear-seat rule and decide whether drivers carry seats. Minibus and coach operators should make the “we do not provide seats” position explicit at booking. And every operator whose vehicles mix work and family use - company cars, grey fleet, the van taken home - should state the vans-equal-cars rule, because the driver who assumes a commercial vehicle is exempt is wrong in a way that costs £500 and a child’s safety.