HR at informal support meeting...why?

[daisyeatyourpeas]

Informal support plan meeting planned for Friday. Checked it was still on with HT this evening as she is not in tomorrow, and that it is informal. Said yes informal and still on and HR will be there as new to job.
Why will HR be there?

Thanks

Have you spoken to your union rep?
Have I understood that you are new to the school? Are you on probation?

What does it mean if its during probation?