From £30 to £25 plus 20% off any booster seat when trading in old (now illegal) backless seats.

Heat added and a good find. While I totally agree that you should not use booster cushions as they're not as safe as high back seats It isn't illegal to still use them if you have one, but it will be illegal to sell them. So no fines for parents. But that's not your point I know and better to take the old cushion and get a £5 off a new seat.
http://www.childcarseats.org.uk/types-of-seat/booster-cushions/

The law which was due to change in December 2016, did not come into force. It is now anticipated it may do during March 2017

So the current law still is:
Children weighing more than 15kg can travel in backless booster seats. (assuming their head would be above the seat back if it were in place and adjusted to the highest position)

When/if the law does change it will say:
Backless booster seats will only be allowed to be used for children who are taller than 125cm and who weigh more than 22kg

As already mentioned, if the changes go ahead, they will only apply to newly sold booster cushions, not ones which are already in use and meet existing safety standards.

Cheers for the info, I was told through word of mouth, so should of done my research beforehand I suppose haha

​while this is true, I think for the sake of £25 to have a safer seat for your child (that meets the new requirements which you must assume has been found to be safer) is that not worth it?

I don't understand why you are making the point that they are probably safer in response to a post clarifying misinformation. It seems like an entirely separate point unless you are suggestion that people should keep claiming that it is illegal?

​I think the poster is just pointing out that while it isn't illegal there is a reason the law is changing. It is because the new rules will keep kids safer on the roads as the seats are more appropriate for their height and weight.
The booster is only £25 though you may already have a backless one you can use, £25 is good value for a safer seat

The joie one is also £25 they have a good reputation on crash test safety. its listed in the kids section of deals. joie high back booster

The joie is what I actually purchased just couldn't find the link on the site as I was rushing. Really pleased with the quality for such a good price

Thanks ordered a couple. I have some old boosters I paid £5 each for so at least I will get my money back.

I can't see anywhere at Checkout that will allow me to bring my old seat in/get a further fiver off. I guess I just select Pay At Store, bring the old seat with me then get into an argument with staff!!! Heh! Heh!