I don't think there are. But I'm doing one last mn call for help before I fork out a lot of money at the in car safety centre. (£220 for the seat, and nearly £20 for the head rest)
DS2 will be 3 next Sunday. He is 18.7kg and over 1m tall. Thus too heavy for a 5 point harness.
When I realised how heavy he was (officially that is, I knew he was a heffer before I weighed him) I switched him to a stage 2-3 car seat with a normal seatbelt ( a young sport - v. nice car seat which I've pinched off his older brother)
Its been pretty much a disaster. He won't stay still - he fidgets, slides out, pulls his 'top' arm over the seatbelt, has even unclipped it a few times (I can't pop into the garage to pay for petrol leaving him in there because I can see what he's up to from the shop - in the time it takes me to walk to the till he'll unbuckle it, climb out and get into the drivers seat which is FAR more fun) He is in a car seat every day. I have come to the conclusion that its just not worth the risk - he's too young to understand how dangerous it is.
I won't buy second hand so thats out.
I'm going to have to get the credit card out arent I?