Done.....the upgrade went well, the presentation and the timing worked, and feedback from both reviewers was excellent.  So although a bit stressful it was a really worthwhile occasion.

Useful aspects of the feedback were to confirm that my work to date is good enough to continue as a PhD (great relief!); but also that I need to broaden my perspectives within the literature review even further to include more of the lay literature on depression.  Looking back now on my first draft literature review chapter makes me realise how far my knowledge and thinking has expanded in only a few months, that first attempt was very narrow in perspective and essentially 100% biomedical.  It has made me understand how easy it is to become very narrow in ones perspectives when working within a particular clinical/professional area.

What now?  Well, I think the suggestion of one of the reviewers to have a second literature review chapter dedicated to illness/disease/sickness, with the first literature review chapter looking at depression and treatments, is an excellent idea which will help to encompass much of the folklore/lay literature on illness etc.  So am now off to review that part of the literature and sort out the chapters.