Ladyman Announces Date for New Child Restraint and Seat Belt Laws DfT Press Release 17 July 2006 From 18 September parents will have to make sure that with very few exceptions children up to 4' 5" in height use the relevant child car seats or boosters in cars, vans and other goods vehicles. I expect that the police will seek to educate as well as enforce, but ultimately parents face being fined if they don't comply with the new rules.