OH's work experience has only been at 3 schools with 2 breaks for maternity but these were within continuous employment at the schools. Evidence of work experience is all in one letter from current head as she has worked at current school for more than 5 years - Letter states evidence of previous positions in previous schools.
Section D of the TC1 form from nz teaching council: http://www.teacherscouncil.govt.nz/pdf/tc1webform.pdf
ask for a list of all teaching service with the exception of that completed during teacher education (teaching practice).
It says to include both short term / temporary (e.g. day reliever) and long term / permanent and the form has space for you to identify which.
How to give evidence of this is not stated but the more you can provide that better so if you can get evidence from local authority or from any agency or the schools themselves it would be an advantage