The Duke and Duchess of Cambridge, Prince William and Princess Kate, and the Prince of Wales, Prince Harry, sponsor an organization called Heads Together*. It is an organization that speaks to the issues of mental health stigma in general, and the effect of that stigma on PTSD sufferers in particular. By promoting open conversations about mental health issues, Heads Together promotes understanding of, and seeking treatment for, mental health challenges for military people. Along with their own programming, Heads Together partners with a number of UK charities already doing great work in fighting the stigma that often prevents people from getting the help they need.
Attached here is one of the many conversations that has taken place under the auspices of Heads Together.
* (It is very much like the organization that Dr. Jill Biden and Michelle Obama started here in the USA, called Joining Forces.)