Thats it really...
one of the safest car seats for 4+ / 15kg+ year olds is in tesco for £22... (instead of RRP £60)
I picked up another today for when my youngest charge FINALLY reaches 15kg... she's 4 years old and 14 1/2 kg today (with shoes and clothes on)
Im hoping she'l make the 15kg mark before she starts school in September!