An interesting story from The Guardian from 1977 (page 5, Feb 5th) on the injured might be treated by the NHS after a nuclear attack on the United Kingdom.
The story discusses a Department of Health Circular on how the NHS would deal with patients after a nuclear strike. It paints a picture of the most extreme form of triage treatment; the priority patients would only be those who would be mostly likely to survive and patients suffering radiation sickness would simply be sent home and deal with it as best they could.
The circular also discusses withholding NHS staff from areas stricken with fallout and in this sense is consistent with the Protect and Survive advice which instructs the householder to lay-in 14 days of supplies – the same time limit the circular recommends that staff should be kept from dangerous areas.
Unfortunately the story doesn’t really cover how may NHS staff might actually survive the initial attack or whether the circular covered this at all. There is no reason to suppose whether NHS staff would be in any less or more danger than anyone else so it seems likely they would make up the same proportion of casualties as the rest of the population. As the nuclear war drama Threads also made clear without drugs, water, electricity and wound dressings most medical staff would be no better prepared to help than the nearest survivor.
There is no mention of the dispersal of staff however it does mention the specific clearing of patients in hospitals for incoming casualties which leads to interesting questions on whether patients could be nursed at home, whether the hospitals themselves would survive the attack in any meaningful way, who would staff them after attack and how many of those sent home prior to attack would need extra nursing care in the aftermath.