My ndn never uses a car seat for their 7 year old daughter. They are fully aware of the law. I know this because my dd was playing out with ndn dc and said why do I have to have a car seat when Alice doesn't ( not real name) I said because it's for her safety and the law. My neighbours reply was ' yes that's true sweetie' my dd said so why doesn't Alice then? Ndn replied because her booster seat will ruin the leather on my car seats.
This was early Dec and she still doesn't use one.
It makes me feel terrible that something bad could happen . All for the sake of some car interior potentially getting damaged.
She drives 1 junction on the motorway to school too, which I know as we do the same route .