Ok, wow. First, thanks so much to everyone for their support. After I read Star's message it gave me the little oomph I needed, so I went away and started drafting my letter. I basically said thanks very much for keeping me in mind when you were looking for someone, however i felt very unappreciated and undervalued by their actions. I also said I would appreciate it if they kept me in mind for short term replacement work and left it at that....

I had started going into detail and it got waaaay out of the short succinct point I really wanted to make. So when and IF they call (knowing them they will probably have forgotten about me by Wednesday!) I'll be sure to let them know what has been pointed out by you all that I didn't even realise- with the huge turnover they see at the school every year it might be worth their while to acknowledge the few people that care enough about their job to make an effort to be accommodating to their needs.

Thank you again everyone, you've given me the push I've needed for about 3.5 years now to seek employment where I am appreciated