I think bus and coaches, and taxis too, are exempt from car seat rules.
The law:
Children aged 3 and above, until they reach EITHER their 12th birthday OR 135cm in height:
*In front seat - Correct child restraint MUST be used Where seat belts fitted, correct child restraint MUST be used
- In rear seat - MUST use adult belt if the correct child restraint is not available in three scenarios:
- in a in a licensed taxi or private hire vehicle ;
- for a short distance for reason of unexpected necessity;
- two occupied child restraints prevent fitment of a third.
In addition, a child 3 and over may travel unrestrained in the rear seat of a vehicle if seat belts are not available
Other Vehicles - Rear Seats
Rear Seats in Small Minibuses
Passengers sitting in the rear of minibuses that have an unladen weight of 2,540 kg or less must wear the seat belts that are provided. It is the driver?s responsibility to ensure that :
children under 3 years of age use an appropriate child restraint if available.
children aged between 3 and 11 years, under 1.35 metres tall use an appropriate child restraint if available, or if not available, wear the seat belt, if available.
children aged 12 and 13 years (and younger children who are 1.35 metres or taller) use the seat belt, if available.
Passengers over the age of 14 years in smaller minibuses are legally responsible for wearing a seat belt themselves.
Rear Seats in Larger Minibuses
Passengers over the age of 14 MUST wear seat belts in the rear of larger minibuses (over 2,540 kg unladen weight). However, all passengers are strongly advised to wear seat belts or the correct child seat on all journeys.
Rear Seats in Coaches
Passengers over the age of 14 MUST wear seat belts in the rear coaches. However, all passengers are strongly advised to wear seat belts or the correct child seat on all journeys.