My reply isnt going to be helpful at all but, I don't think that there is a strict guideline of how long you wait, who you see, when you see them etc. Everyone on here will have had a different story about the time they waited from initial appointment etc.
My referral went straight from my doctor to St Richards in January 2009, my first appt with the consultants was April 17th. In May 16th was my appt with the dietician, June 26th I saw the psych and then I got put on the 'waiting list for surgery' beginning of July. My surgery is scheduled for 27th November my pre op is 13th November (this coming friday).
some people on here seem to have waited longer for an initial appointment ( I think that depends on your PCT) and if they have all your forms in place.
Also, maybe, it might depend on your health needs.
If you start to feel that there might be a 20 week or 18 week or whatever week goal in your mind you might well be disappointed so best maybe to go with the flow and just not get any dates or goals in your mind. I know this is easy for me to say because I'm almost 'there' but believe me, its not, I was frustrated through being misled by 'dates' and 'timescales' given to me as much as some have been on here.
Each case is individual and different.
Sit back, relax and just go with the flow is the best advice I would give.
Regards
(yet another) Julie