um, 'on report'?
so, they've had him on a behaviour management plan for a whole year previously, and he's still writing 'x is gay' on the board?
did you have a copy of the behaviour policy? did you and ds sign up to a behaviour contract?
or is this a sort of woolly 'on report' that just meansthat sometimes they write in a h/s book?
i'm assuming he's yr 4 now - the same age as ds1.
you need to speak to the senco. you all need to agree a behaviour plan. the rest is all good, too, but if he has been 'on report' for a year and they are talking about excluding him, it may be that you have not appreciated the steps that have been taken already fully
'on report' ime, is certainly a step taken when a behaviour plan is not being adhered to - and can indeed be a precursor to exclusion - you need to check the school's behaviour policies and work out whether you have not recognised the less formal bits of the process (or if they have not been explained to you adequately). you do need to discuss this with the school to make sure you understand where your son is at according to their behaviour policy.
i'm worried now that they may have been adhering to their own behaviour management plan/ policy, and you may not have been fully aware of the seriousness of the steps they were taking.
they do still need to prove he has been given adequate support for his needs (and you are totally within your rights to ask if ep and/ or ot assessment can take place), but there is a difference between a child being unable to sit still, and a child that writes 'x is gay' on the board (when he is on report, lol) the management would definitely be different. (not saying a one off daft comment on the board is anything to get excited about - ds1 could equally do the same) but you need to clarify what's going on tbh...