GS (nearly nine) has just moved to a booster seat, in both his parents' car and in ours - they aren't expensive. You can get a decent one from Halfords for about fourteen pounds. I have, however, kept his isofix last stage car seat in case we have to do a longer journey than to and from school. Getting him into it now will be another matter - apparently it is not "cool" to travel in a car seat! He gets to travel in his father's two seater occasionally and therefore thinks he can sit in any front seat. He can think again! The sad thing is that once you've finished with a car seat, you have the Devils own job to get rid of it. Charity shops won't take them.