So, we have him strapped in with a 5 point harness (which he wriggles his arms free of), and then then main belt holding both him and the car seat in.
Driving down the motorway today he wriggled chest free, then UNCLIPPED the whole seat.
HELP
Would one of these hold him back for long?
Desperately trying to not have to spend the £50 on the SN harness but will if I have to to save his life!!