Other than those ex-servicemen and women who have a medical condition as a result of military service I do not see that we should have any sort of priority for medical services over those who have never served.
I fundamentally disagree with you there. Anyone who joined prior to about 1994 will have joined up with the right to use Military Hospitals for the remainder of their life. When they were done away with, that right should have been perpetuated in the replacement arrangements. It was not, and that is wrong. If that means priority in the NHS, then that would be appropriate.
Not that it affects me now, as I am an ex-pat, but that very issue continues to grate.