You can certainly bring all this to Ofsted's attention, but their power - and arguably, their willingness - to do anything about it is very limited right now. Best to think of it as something that keeps the heat on the LA.
Ofsted will, at some point in the next 12 months, start inspecting LA SEN services to ensure that they are playing their part in the glorious new future for SEN provision brought about by last September's legislation.
Right now, Ofsted are still working out how they are going to do that. They don't know right now, for a variety of reasons - one of them being that except for a few decent inspectors, they corporately know fuck-all about SEN. And fuck alone knows what will actually happen to LAs if Ofsted find them below-par.
With luck, Ofsted would file away stuff on the unlawful non-appearance of the statement, and take it into consideration when they come to inspect your LA. I wouldn't count on this happening, though.
OTOH, Ofsted would be more willing to listen right now to the shit that your school have put you through. This is very much their core business, and you have ample evidence to throw their way.
Let me know if you need contact details for people there...