It is a card that proves your child has special needs/disability. It is really handy as the council have also sent a list of venues (such as swimming, cinema, legoland) etc and shows you where you can use it to prove you are a carer the savings you make. They have also shown them to all of the shops, libraries etc so if need be you can show them say if you are in a ahop etc. Saves all that faffing about with letters and forms!
I have been saying we have needed one of these for years!