A quick look-see around Internet land would suggest that John Lewis has these Trunki BoostApak travel booster seats on sale for the same price BUT you will pay for delivery, unless you can go and collect it from the store; the remaining usual suspects are all selling them for the full retail price.
A Trunki BoostApak travel booster seat before is an interesting combination of a booster seat and a backpack and rather ingenious, I think.
The law requires all children under 12 years old, or 135cm in height, to use a booster seat - my oldest two were mortified when this law came in and were most relieved when they were over the height limit!
We all know this particular law makes good car safety sense - not like the 'cram as many kids as you can in the back of the car' ways of my childhood - but it does mean you can be caught short without a booster seat if the unexpected happens; a Trunki BoostApak is a nice solution.
Suitable for children aged between 4 and 12 years old, it's a hand-luggage approved rucksack which doubles as a booster seat and is very handy for car-sharing and and taking on family holidays.
If you're going to be out an about travelling by train or bus it will allow your child to be high enough to look out of the windows and if you need to grab a cab then you'll still be able to comply with car safety law.
The Trunki BoostApak has fold-out seat belt guides, hi-visibility horns and reflective trim and the cover is removable cover for cleaning.
Thanks to ladylowe at HUKD