Sorry @SnowlayRoundabout I am probably being rather dense, but I am not sure what you are saying here?
Firstly
'if I believe that people suffer from mental health...'?
Well yes, I know that we all have mental health, some people seem to be lucky enough to only "suffer" from good mental health, but I suspect that for that to happen during their entire lives is rather unusual. I believe that most of us will have at least one episode of poor mental health in our lifetimes, and as I have already said, I have 'suffered' from differing degrees of poor mental health for most of my life, so yes, of course I believe in the phenomenon of 'mental health'.
To try to reply to the second half of your sentence - which I really am struggling to understand - you say that I clearly didn't derive much benefit from those explanations; if you are refering to the explanations about mental health, and how no-one should be ashamed if they have mental health problems, the only thing I can remember thinking and feeling when the Prince and Princess of Wales were on one of their trips to institutions that deal in some way or other, with poor mental health issues, was, and still is, frustration.
I have never as an adult, been ashamed of my own, or anyone elses problems with poor mental health. I say "as an adult" because unfortunately when I was a child, and sadly had OCD, I was very worried that someone might find out about my OCD, and think that I was very strange. These days, if appropriate, I am very open about any, or indeed all, of my problematical mental health issues.
My frustration is born from both my personal experiences to do with my own, and my family's, mental health concerns, and my observations from around England, that have shown time and time again, how incredibly difficult it is (and how far too often it is), to actually receive any meaningful help with ones own, and ones loved ones, poor to atrocious, mental health conditions. The Royal couple seem to always go to hospitals, clinics, or other places dedicated to helping people with their mental health problems - of which the P&P of Wales staff must have quite a problem routing out. They only appear to go to the places that may be privately or charitably run, or are NHS, but have somehow managed to negotiate some sort of help for their patients.
When William and Catherine are on our screens promoting one organisation, or another; or chatting and laughing with the "sucess" stories, I am - not quite - shouting at the screen, that these people and institutions are vastly in the minority, so please stop promoting them, and instead start pointing out how difficult it is for most of us to actually get any help (good or otherwise) with our often devastating mental health issues. I then want this Royal couple to put themselves out by dedicating their time, and energies, into researching and discussing the most important issues - which imo are -
the awful lack of monetary input into the MH,NHS, and the dreadful education and training (not actually) provided for what appears to be the vast majority of MH practitioners. Which of course then leads to the situation that we have already been in for far too many years, where the so called experts, along with the Government, and the NHS 'top brass' fail to deliver any sort of meaningful advice and treatment. I do know, and have myself suffered from, the fact that all of the NHS is now (almost?) broken, and may be beyond the wit and ability of anyone who may have, at one time, been able to rescue the NHS - including the MHNHS. But even the death of the majority of the NHS, should not lead to those with mental health problems being left once again at the bottom of the pile.
That is where I probably disagree with at least most of the Mumsnetters posting on this thread, I do believe that our mental health is just as, and maybe even more, important as our physical health. So @SnowlayRoundabout have I manged at all to answer your non question?