Mum and dad boss are both insisting that there ds does not need a CARSEAT when I take him out in the car. He is tiny for his age (more 3 year old size) so I'm sure he needs a car seat preferably a high back booster.
In result of them not supplying one I've stopped doing any extra activities with him after school that involve a car journey - which they are not happy about
It's quite clear that the only time a child can travel without a car seat is in exceptional circumstances. Other than that, keep refusing to take him on any journeys requiring a car. As the driver, it is you who will be fined, not them!
Government recommendations:"Children must use the correct car seat for their weight until they reach 135 centimetres tall or their 12th birthday, whichever is first." The law on car seats: "It is the driver's legal responsibility to ensure that the child is correctly restrained."
Why on earth do they not want their child in a car seat?!
Do they even put a seat belt on him? They need to have words with a paramedic or police who have attended road traffic accidents where small children have been seriously injured to think about the consequences of their negligence.
They are mentalists. You have to refuse to take him in your car without a car seat. Hopefully if you make it inconvenient for them they might do the right thing and buy a car seat. Some parents just don't deserve to have children.
If you drive past a car in public and a child is not restrained with a seatbelt - i.e breaking the law, can you phone the police? I've wondered when driving past obviously unrestrained kids before. I'd be very tempted if I knew a family that was doing this on a regular basis.
You explain to your employers that as part of your job you will teach wee boy to sit in a car seat. Pitch it as a favour. I bet you can even hire one to convince them. I bet you will get him sitting in it (might not do it for mum and dad though but that's hardly your problem).