.. Because half of me is screaming "He's perfectly normal, stop trying to push your appalling parenting onto your innocent child", and the other half is screaming "You should have pushed for this a year ago!"
The referral has come about as a result of a strongly worded (but absolutely NOT rude) letter to the school nurse, explaining that I want him excused from weight checks and why - he has a weird interest in scales and weights and cause and effects and why etcetcetc and I could see him deciding to to eat anything to see what would happen!
The Aspergers thought is me, btw, nothing anyone else has suggested.