He was seen by the HV and a nursery nurse who create the applciation which is then reviewed by the multiprofessional team who decided if he needed assessment.
he then had four x 2 hour sessions (weekly) with a multi disciplinary team, where he has been assessed by early years, speech and language, etc. I can't remember who they all were, but they did so many tests with him, and lots of observation.
followign this we had a session with the paed which lasted nearly two hours again, with yet more tests and asking me all questions under the sun! 
Now we've been referred for blood tests, hearing tests (no problem, but to rule it out), ecg (also no problem, putting this one off).
We have a consolidation appointment in 3 weeks, which will involve all the professionals, the paed, and my HV and the nursery nurse who originally met with us. The bloods won't be back by then anyway, but the plan is normally to give soem sort of idea or a dx by then and that appointment is really to sort out what help he needs etc. So at this point I really felt that they should have a better idea!
I am hoping that maybe they do have a fair idea and aren't telling me, or at least will have when they go through it all again - at the moment they have pages and pages of reports, which the paed has seen, but I haven't.