Yes, I can tell him to stop.
No he does not stop.
I will keep telling him to stop, but in the mean time need to find a car seat that he can't let himself out of when I'm doing 70 on a motorway.
I had a Janet one (I think that's what it's called) but he reached down and loosened those straps from about 18 months.
Now he's 2 and undoes his current one which is just a Cuggl from Argos.
Help!