PJ - good luck for your interview, a few years back I actually used to work as an HR advisor within schools, it's a great area to work and I loved it. You've identified most of the key areas, but I've thought of a couple of other things that came up a lot when I was in the role, hope this helps...
Disciplinaries, sadly this at times could extend to child protection cases (be warned I've seen & heard some very upsetting things, but this is very rare and colleagues who have worked in this area never had a child protection case), so knowledge of CRB useful also how you might work with other agenices in such a situation ie police, social services, other education authories etc.
Restructures, redundancies - if pupil numbers change so does the staff size, schools plan to birth rates but also need to reflect to shifting changes in the population,
Absence Management - obviously it depends on the schools but I had some schools I supported with lots of teachers who were on long term sick leave for stress
Recruitment is key - hard to recruit good heads and some subject teachers, also some support staff posts can be a challenge to recruit to, were I was working caretakers and lollipop ladies/men were hard to find
Salary Scales - lots of different methods of paying the teachers and support staff and different allowances for teachers - I'm a little out of it now but google TLRs (teaching and learning responsibilities) for more info
I hope this helps, don't worry too much about the discplinaries, thought I should mention it so you are aware this can arise but it is not common so there are so many safeguards in place very few abusers can get into schools. Good luck let us know how it goes