This is an area in which supply teaching agencies can differ enormously, just as the amount of support teachers demand of them will.
As is written elsewhere on here, you can build up a great relationship with your point of contact at the agency, which can be of great benefit day-to-day. Supply teaching can be an isolating role, and it's nice to be able to call the agency to share your achievements and worries with regarding the school day.
If ever you have a problem in a school, your agency must be notified immediately. Then your teaching union. Your agency should have set, tried and tested procedures to work through in all instances, and, knowing the school and yourself, is best placed to advise you on how to proceed. Many teaching agencies, and most teaching unions provide legal support.
