I'm a fit and active woman who had gradually worsening coccyx pain for several years, to the point where I could not sit for more than a few minutes. I found Michael Durtnall and the Sayer Clinic (see Doctors and specialists in the UK, London) on this website, and was treated several times by him and his colleagues, who were kind and caring.
Thanks to this treatment, and advice on using cushions and a sit-stand desk, I had a real reduction in my pain, and reached the stage where I could sit for up to half an hour without pain.
Michael Durtnall then asked me to post my experience on coccyx.org. I was rather reluctant, but I did so because I felt almost obliged to, as I was continuing with treatment and a refusal would put me in an awkward position. I wonder whether other patients who have had pain relief have done the same. This is not to say that the pain improvement was not genuine, but we are missing the stories from patients who do not find relief.
In my own case, the rest of my pain later subsided almost immediately after I stopped studying/working 60 hours a week, and shifted the way that I focused on the pain. Now, I have occasional soreness on flights and long car trips, but this is nothing compared to before.