Hi, thanks for all the replies 
ds has been asleep since 7.15pm so I've tidied up, had a coffee in peace and have a few spare minutes now.
I picked ds up this morning he had continued the behaviour, kicking with his piedro boots on so they had to temporarily remove his shoes to stop him (his boots weigh a ton and hurt when he kicks with them on) he was then removed from the classroom for throwing toys and taken to the sensory room to read stories and his 1-1 tried to give him a shoulder massage to calm him, she put shoes back on and he didn't kick again but he continued throwing so she had to walk him up and down the corridor showing him things to distract him.
They are doing there best, but I don't think they've had a dc like ds before. He has ok days there were they get all the learning jobs done and she says he's had a good day and then there's days like today, I think today was as far has he's gone up to now, but the defiant behaviour is more frequent recently so he's having more bad days at school unfortunately.
I suggested autism outreach support to come in, but if I'm honest it's the same people from the cdc and it's one strategy fits all so not sure how useful that will be. As we have had there input before at nursery and it was useless. But I have at least suggested that to see what they can take from it.
Ds 1-1 is extremely understanding and doesn't seemed phased by it to be honest, she's trying to work it out like me, she's writing a daily report up each day and going through it to identify anything, I apologised for this morning & she was fine. Ds head is ok thanks @openupmyeagereyes he was head butting her with the top of his head sort of repeatedly throwing his head back and ramming his head into her if you get me. he was doing it for a reaction as he was laughing but it was like sensory seeking behaviour actually now I've got 10 mins to think properly, he gets really rough and enjoys it. He is on the waiting list for private sensory integration therapy they said it will be April time they see him he's been on the list since September but might ring tomorrow and see if they could get us in any earlier.
We will be having a meeting with school shortly and will try to address everything and speak about EHCP etc.
Regarding the 2.5 hours at school, he has been on those hours since September, they said they would keep him on that till Xmas then increase hours after Xmas gradually but the increase hasn't happened. I've requested several times, but I have a feeling the difficult behaviour recently has put a halt on that? They say it's because the senco is off sick and need to sort with her first. But either way ds needs an education so needs sorting quick he's only currently at school 12.5 hours a week.
I also need to take ds to drs which I will book tomorrow, he has never pooh'd normally sorry tmi! Hes always loose (limited diet and eats quite a bit of fruit) so because of his limited diet I put him on spatone iron for a few months and it made him constipated so eventually stopped with that but he's back to being loose but he sometimes says tummy ache and farts a lot and the odd time he's constipated again which we give lactolose for when he's constipated (we did see gp in November regarding this who gave lactolose for when constipated) so think I will take him back again, as he can't tell me when he's in pain he will just randomly say tummy ache every so often but he sometimes says tummy ache when he has a visible cold ie runny nose etc so it's confusing as I think he feels not well but gets muddled up as he's not sure so says tummy when he possibly means under the wether from a cold, so think a trip back to dr is in order and see if he can examine him to see if he is constipated or whatever. clutching at straws but could be worsening behaviour if he's suffering with tummy.
Need to also ring continence team regarding toileting (still in nappies) but suppose at the minute that's least of my worries.
This afternoon we had pretty much the same sort of behaviour at home, but last night he only slept for 7 hours and he was really tantruming today everything being a big deal so I think or in fact I know he was tired so that's played a big part. He also gets like that when hungry. Another thing to sort is melatonin! next paediatric appointment is a few weeks away so can do it then.
We had the private SALT this afternoon, first appointment for an assessment which I was dreading given this mornings antics. I nearly made her put full body armour on before she entered 
She's came by recommendation, I spoke with her twice and exchanged emails and she seemed really knowledgeable. She travels an hour and half to us.
She thinks his range of vocab is really wide as in the words he can say and his sentence structure is fine as he can put words into a sentence, she showed him a toy elephant and asked him what it was and he just replied 'elephant' but then she showed him an aeroplane and he answered 'that's an aeroplane' so when it's following his interests you get more from him, so she said unless whoever it is that's assessing him is aware of that then they will hear him say 'elephant' and just mark him down as low when if in fact they showed him something of his interest he would say more and be marked up higher.
She also said his speech had a few immaturities but nothing concerning for his age.
But his problems are the use of language and it being functional. His concrete understanding was better but his abstract was very delayed.
She couldn't give me an age he's at right now as she said he's very spikey and she would like to see him a couple more times before she gives us a more accurate answer.
She's confident he will be able to have a conversation at some point in the future & he needs manually teaching this in small manageable steps as it's not coming naturally as it does with NT children. She doesn't think he's got a language disorder, his language is just typical of asd and is also delayed.
She said she has lots of things in mind and would really like to work with him and she seemed to think she could help. She said we were doing everything we could to help and to carry on the bits we do. She's sending us a detailed report out so that will be interesting to read.
Sorry that was long.
Just writing my thoughts down as you do.