I claimed DLA for my son, who has Downs Syndrome, when he was about 4 1/2. He gets the higher care rate, but I was told to re-apply for the mobility part once he was five. He is now 6 1/2 and I have just rang them to ask to send the forms. 
They arrived this morning, but it is the whole form by the looks of it, not just the mobility part. Is this right? Do I have to apply for the whole thing again?