Right ladies can anyone tell me whats the do's and dont's about childrens car seats i know the laws changed etc but its really bugging me now as my mum has my 2 lo's when i work she now needs a different car seat for frankie as her carrier seat she has way outgrown and doesnt even fit into properly and lewis is getting a little big for his anyway she went to halfords to go out and buy him a hi -back booster seat but they advised her that she wouldnt be able to purchase one as he has to be atleast 4 before he an go in one and frankie needs to be in a rearward facing seat until she's atleast 18months old she basically they both have to be scrunched up and sitting in car seats they have outgrown until then? they also told her that if she was stopped by the police and they seen that they werent in the correct seats that the police can caution her or whatever they may do for not being right???