The NHS generally prioritises treatment based on need. One of the issues that the Military Covenant has tried to tackle has been the bureaucracy and list-sliding that occurs when SP and their families move into another Health Authority jurisdiction. This is generally not a problem for personnel who are still serving (we are effectively treated as private patients) but it can be an isue for dependents that are already on a waiting list with a chronic or acute condition.
I suspect the average PPruner (serving or 'ex') are able to put up a robust argument to a Health Authority when this happens; however think of your young squaddie's family with his 'partner' and snotty nosed brats - little formal education (typically), little understanding of the System and hubby away for extended periods...this is where assistance is required to receiove proper NHS treatment.