Re: aggressive and difficult behaviour in 3 year old.
You seem to be doing all the right things already dealing with all this, getting him the extra help and such like.. I don't know if my suggestion's appropriate or not, but have you had a chance to see if there are there any long term changes in routine that might cause generally better or worse behaviour? For example, would there be any difference in the holidays when he's out of Nursery and at home more - it might suggest increasing or decreasing the hours? Or anything else that has an effect?