Yes, Book Doctoring, WW-style, is you sending in work in advance.
One of me or Debi or Craig or Rebecca or Jeremy then reads it and
makes notes, and on the day we discuss the kind of things it lists
here (apologies if you've already read that)
http://www.writersworkshop.co.uk/festivals/getpub_docs.shtml
and we then hand over the notes and possibly the scripts as well,
if we've written useful stuff there too.
A full-on editorial report is a bit different (as well as more
expensive!). This is my take on it, which you might find useful if
you're thinking about it:
http://emmadarwin.typepad.com/thisitchofwriting/how-to-get-the-best-out-of-an-editorial-service.html
To be honest, as that post suggests, I'd always suggest going as
far as you can on your own, or with free or inexpensive help,
before you shell out for a full editorial report. There's no point
in spending money on getting someone to tell you stuff you would
have picked up on anyway with a few pointers. Also, the more you
know about your own book, and about writing in general, the more
you'll be able to decide what to do with the feedback you
get.
Talking of which, if you're at the revising-and-editing stage you
might find various other posts in the Resources section of my blog
useful:
http://emmadarwin.typepad.com/thisitchofwriting/resources.html 
