The Police National Computer does not immediately identify individual nominal records as being military personnel, family members of military personnel or civilians. At face value all of those persons with a record on PNC would be regarded as 'civilians'.
While it is possible for an individual's employment to be recorded as being a member of the 'armed forces', it is only possible to see those details by delving deeper into a specific record, once that record has been selected by name.
It is possible to make a general inquiry of the Police National Computer to identify all of the records where 'armed forces' is shown in the employment field. However, this would return a list of names and very few operators have that level of search capability.