Hi, I thought I'd post this to make sure people are aware:
www.toysrus.co.uk/medias/sys_master/h33/hff/8826151075870.pdf
Apparently seats bought from Mothercare should be ok but if you have a Stages from Toys R Us or Halfords you need to check the date code against the above link and return it if needed for a refund or exchange.
I hope this helps someone!