Guys, thankyou all very much indeed (and thankyou Madame C for the apology/explanation - that's very good of you and I understand what you are saying.)
I have another update which is that at the class teacher meetings today, I was told that the senco is in touch with our local dyslexia expert (who we know personally and is completely brilliant) and has asked her to come into school to do the WRIT with ds.
This won't be till after half term now but still - we are finally on the right track. I have spoken to the senco now and we have agreed that she will get this person in for the initial test, and if that indicates there is a problem, then we will pay privately for a full assessment and report because actually, in the test that was done in July, ds couldn't do something that he should have been good at - and so they had been in touch already to try and get some input.
It did take a lot of fuss from me to get them to do all this but at last they are going to try and help.
I want to address what you said MmeC, because it is important - I don't want him to struggle wherever he goes to school, and to that end I think it is really important that we find out how his brain is operating, because (as the senco has now admitted) there is something going on but she can't put her finger on what that is.
It's not classic dyslexia, but we don't know where he is falling down and I really just want to know that so that I can formulate an approach at home, to best help him, and so that the school can have some guidance or access some sort of protocol on how best to support him - and moving into senior school I think this will be really important as well.
Ideally I'd have liked him to have had this sort of input far sooner. I have been asking his teachers regularly since he started school to assess him for dyslexia, we had him assessed in y2, and the result was maybe/maybe not with a high IQ score. We didn't get a report at that stage as the person was too busy...this time I hope we can.
I've also done a fair bit of research on here and asked loads of people for help, the national dyslexia organisations and so on but everyone said even if you get him assessed properly, the school won't be able to do anything/will ignore it unless it is through an ed psych and the school just kept refusing to do this.
At home I have been making charts for him, trying different ways of teaching him visually, of making sense of stuff for him, sat with him doing his homework over and over but without the right methods a lot of it just doesn't seem to enter his brain. It reaches the periphery and kind of floats about.
He has massive issues with concentration and this is as much a hindrance as the other stuff I think.
I wanted to help him but didn't know how, or what was wrong, and no one seemed able to put me in the right direction.
Anyway I don't have a clue how this might affect his secondary school and what influence it might have on any appeal we make. I agree he would find grammar quite hard. But I think if he had the right support, he wouldn't be in that situation in the first place.
I'm not pushy, and I'm not convinced he's a genius. What I do want from this is a way of helping him that actually works, so that he doesn't seel so shit about his own abilities, and can go forward with a little bit of confidence instead of being depressed and unhappy.
Hope that makes sense and thanks again to everyone who gave me the confidence to go in and tell the school I wasn't happy.