By law, a licensed black cab or private hire vehicle at Heathrow does not have to carry a child car seat. If the driver cannot provide the correct seat, a child can legally travel on the rear seat without one, under specific conditions set out in UK law. In practice, this means you cannot assume a Heathrow taxi rank vehicle will have a car seat waiting for you, and if a seat matters to you, the safest approach is to bring your own or pre-book a transfer operator that guarantees one.
The legal position for taxis and minicabs
Under UK child car seat law (gov.uk), taxis and minicabs, which includes licensed private hire vehicles, are treated differently from ordinary cars. If the driver does not provide the correct child car seat:
- A child aged 3 or older can travel on a rear seat wearing an adult seat belt, without a child car seat.
- A child under 3 can travel on a rear seat without a car seat and without a seat belt, since no suitable restraint is available.
This exception exists specifically because taxis and private hire vehicles are not expected to carry every size of car seat for every job. It was introduced for practical reasons, not because it is considered equally safe, so it is the legal minimum rather than best practice.
Outside of this exception, the general rule for cars is stricter: children must use the correct child car seat until they are either 135cm tall or 12 years old, whichever comes first.
What this means at Heathrow's taxi ranks
If you hail a black cab from a Heathrow terminal rank, or take the first available minicab, you should not expect a child seat to be fitted. Drivers are not required to carry one, and stock varies by vehicle and operator. If your child is under 3 and no seat is available, they can legally travel unrestrained in the rear, which is far from ideal for a motorway-speed journey into London.
How to guarantee a child seat for your Heathrow transfer
If you want a car seat rather than relying on the legal exception, book ahead rather than hoping to find one at the rank:
- Pre-book with a private hire operator. Companies offering Heathrow airport transfers, such as Addison Lee and other licensed operators, can usually provide a child or booster seat if you request it when you book, often at least 24 to 48 hours ahead.
- Specify the child's age and weight. Operators need this to bring the correct seat group, since a seat for an infant differs from a booster for a school-age child.
- Confirm any charge. Some operators include a seat free of charge, others add a small fee. Ask when you book so there are no surprises at pickup.
- Bring your own seat as a backup. If a guaranteed seat matters, especially for a baby or toddler, packing a lightweight travel car seat and fitting it yourself removes any uncertainty.
Black cabs specifically
London's black cabs (Hackney carriages) are licensed by Transport for London and follow the same legal exception as private hire vehicles: no obligation to carry a child seat, with the same fallback rules for unrestrained travel. Some black cab drivers do carry a booster seat, but this is down to the individual driver, not a guaranteed feature of the vehicle, so do not rely on it for a young child.
Practical tips for families at Heathrow
- If your child is old enough for an adult seat belt (generally 3 and up, once they meet the height and weight the belt is designed for), the legal exception is a genuine fallback, not just a technicality.
- For infants and toddlers, treat a car seat as something you arrange in advance, not something you expect to find on the day.
- If you're taking the Elizabeth line or Heathrow Express instead of a taxi, you avoid the car seat question entirely, since neither requires one.
Checked 2026 against UK government child car seat guidance (gov.uk).