Advice on in car restraints for sn 4 year old

[Peachy]

DS3 has been unplugging his car seat mid-journey for ages, and we're going to have to acknowledge its now become a habitual behaviour.

Anya dvice on car seats (he currently ahs a standard Britax of the 9 months plus variety- ancient but excellent) or ways of adapting them would be useful. We spend a lot of time on motorways going back home at weekends etc, and thats awkward as you wither continue with DS3 at risk to a junction, or pull o ver and get the police yelling at you like today.

Do you mean he's undoing the harness of the carseat, Peachy or the seat belt holding the car seat in place? I use a Snugsit/Hugit to keep DD from removing the straps of the harness as she's a bit of a Houdini - works well.
I believe there are also devices which go over the car seat buckle - anyone know?

Hi Peachy, this harness does up at the back so might be suitable - will fit over a booster seat. www.crelling.com/MODEL-29%20SINGLESEAT.html

he undoes the seatbelt and climbs out that way- as we have an Espace, it means he can wander freely in the back which is obv. really dangerous. The only alternative would be to move him to the middle row but that would place him next to ds1- also not the safest of options sadly (DS1 also SN and prone to violent outbursts)

Will have a look at those links / ideas, thanks.

Would something like this help at all?

My uncle drives SN kids to school. He had a child that was doing this and he just turned the seatbelt stem round so that the child couldn't see the red bit to press. He then told the child it was 'magic' and would only release when he got to school and rang his mum. His mum could then release the sealtbelt by magic.
Apparently it worked a treat!!
Give it a try first - it's a bit cheaper then a harness!!
Good luck