Tezk you are a star!!!!!!!
Have read the thread you posted, looks just like the same problem see picture below i just took of my dizzy, missing pipe A and associated bits!!!!, pipe b is in place though.
Check out the one form BMWfans i am missing parts 9 to 15, part 9 looks NLA

, have to find this vacuum pipe from somewhere else, plus no idea where part 12 is fitted either
Part 16 is not highlighted on the picture and is not on the list, i can only assume that on my car this part is not used, as its an earlier car than yours??.
I wonder if like the Op in your link thread this has anything to do with the really crap economy i'm getting at the mo, full tank = 240 miles ouch!!!!!!!