From someone who has taught 20 years in now 5 secondary schools I just want to say thank you supply staff. You are the bread and butter of the school. You step in when the regular (and usually still paid) teacher is off for whatever reason. You never have enough information. You make do. When you do the job well - no one notices. Because you are doing the job. Sometimes you have first day nerves every day. You often get the worst classes with the worst preparation. So thank you. You are needed, appreciated and valued. Schools could not run without you.