Hopping
I too am sceptical of the assessment, the ed psych was a student in his final year so not even qualified yet, let alone experienced so possibly not a great assessment. DS1 has a Youth Worker and has said school have put him 'top of the list' to now be assessed this term (by a qualified ed psych) so hopefully that will shed some light.
SoMany - Yes I think I will probably post on SN board. It's interesting what you say about ODD being something that is created rather than already there. In which case I really don't think he has ODD. I need to do some more research into ADHD as you've said it is a really misunderstood area - and could really do with some tips on how to gain back some control as at the moment I feel he (DS1) controls the whole household.
We went through the Cahms system when DS2 was 5 -7 (long time frame due to being lost in the system and them frequently cancelling and postponing appointments) Finally got a diagnosis when DS2 was 7 - DS1 was 9 at the time.
The reason we were there for DS2 not DS1 was that DS2's behaviours became more obvious from a very early age that something wasn't quite right including developing little routines and rituals.
These included having to sit on a certain side of the car, refusing to sit on a mat with the other children in nursery - he would have to have a 'special chair'.
He was also 'sensory' at a very early age spending hours, sifting sand from one hand to the other or going outside to 'feel' the grass by carefully running his fingers from the bottom of the grass to the top - he went through a phase of collecting cardboard boxes and refused to go anywhere in the car unless we could take them with us (I had to keep putting them in the boot LOL.
Later on when at school he would have more difficulty following instructions and would sit in the corner pulling the elastic out of the top of his socks as he would somehow find this comforting. He felt the need to collect all the bits of BlueTac off the walls so he could put it in one big ball and safely keep it in his pocket.
I think it was safe to say it was pretty likely he was on the autistic spectrum!
However,
DS1 was never that 'bad' (obvious) at a younger age - he clearly didn't enjoy school or being told what to do but he was no where near as defiant or controlling as DS2. DS1's behaviour gradually deteriorated in a subtle way and we just thought he was being a 'bit naughty' (as did his teachers), it was only when he was 10 / 11 he went full on with his aggression, anger and blatant refusal to conform to either our rules or that of the school. (Presumably his behaviours were heightened by the onset of puberty).
Although we always mentioned to whoever we were seeing at Cahms (for DS2) that DS1 also had issues, we rather naively thought we couldn't possibly have 2 children with SN issues - how unlikely! Of course, since then I realise it is actually far more common that siblings can have SN , I think I maybe brushed it under the carpet subconsciously as I was maybe a bit overwhelmed with DS2 -.
I have had a look on the Young Minds website, although haven't actually contacted them yet. I too have heard they are helpful
I was given some good advice from some specialists we've seen about DS2 (which applies to DS1) such as try and reward any positive behaviour no matter how small - this of course is quite tricky when you have a child who is generally not that well behaved! Although occasionally DS1 has been really over protective over DS2 with him just starting High School. I thought this was really nice and told DS1 how proud I was, but he didn't seem comfortable with this, just shrugged.
Also that you cannot control what they do but you can control how you respond - this is good as I don't ever raise my voice or enter into any confrontation when he (DS1) has done something inappropriate and it does limit the 'explosions' at home - however overall I just feel I am rewarding any glimmer of good behaviour and ignoring all the negative stuff which surely doesn't make me a very effective parent.
Thanks again, hopefully this appointment for Cahms will come through sooner rather than later :)