Plus, other tips:
1)for speed, if waiting times are long, I always recommend you go private to start with, if you can afford it.
But ask for the NHS referral through your GP as a starting point. I asked GP for referral. NHS. Ours was actually reasonably quick. By the time I got there they'd already asked school and school had insisted he was 'fine.
Instead of the consultant I was supposed to see (Top Dog) I weirdly got allocated the ADHD specialist, who was dismissive and told me to come back in a year.
My mum said she'd pay for me to see the consultant I was supposed to see. Privately. He sent me to see his female friend. Who did tests and said that he had loads of traits, but was very spikey, and some areas none at all. She said his theory of mind was 'off the Richter scale' , worst she'd seen for years, and his lack of empathy, and lack of ability to think through consequences, was severe.
School still insisted he was fine and I was imagining things. £200 well spent.
I then asked to be referred back in to the NHS. And had no more work done privately. And strangely all of a sudden was allocated another NHS appointment for the next week. What a pleasant surprise!
Doctor who I was supposed to have originally seen on the NHS , (who I had obviously seen privately, now had his friends privately paid for report infront of him), at our NHS appointment, apologised for his colleagues dismissive attitude previously, and said things had been "overlooked" by colleague.
2)Talk to HoY and Senco at school. Send an email, so you've a paper trail.