no problem RaggedRobin... I think the level of support you get varies by authority.
Ds's SALT has been very helpful with involving other professionals, she encouraged us to see the consultant paediatrician, which took ages... but ds was almost completely unmanageable to start with at nurrsery and the staff really struggled to communicate with him, so they were in a hurry to get help!
It might be worth having a look at your local council's web site to see what they have, you could contact education services they might advise...
my ds hasn't got a dx yet (salt also mentioned hfa/language disorder, clinical psychologist has mentioned a future dx of AS), the Paed said "asd traits" and that is basically what we have to go on... but considering that he is under a multi-disciplinary team, so all the professionals are involved without me having to contact them individually.
It might be worth trying to get in touch with early years support services in your area, my ds early years support teacher has been fantastic, she helped me through the minefield of dla, which we were awarded middle rate this year without a dx.
Ed psych was not really much use imho... the one we have has observed ds very briefly a couple of times in nursery, but she is not very engaged.
I would make an appointment with your gp to raise concerns, get the ball rolling... you sound like you are dealing with it all better than me, when my ds was 2.6 and I first saw the salt and he started sn nursery I was a wreck and in denial about his issues... he is 4.6 now, we see the clinical psychologist now too, and I am slowly, very very slowly, coming to terms with it all.
On the positive side, my ds is making progress and his speech now compared to a year ago has really improved. Even 6 months can see vast improvement in speech and behaviour (not always I know), but I think being pro-active helps... don't wait for a dx (which is kind of what I have been doing). Think about when you send in the enrolment forms for the nursery, it might be a good opportunity to let nursery know about your ds... and maybe ask about taking him in before the summer holidays start just to see the nursery and let them meet him.