Okay, update! I'll try to keep it to bullet point style paragraphs, as the whole thing is so darn convoluted.
One detail I left out previously (worried I would be outed) is that I also head up media studies in the school, alongside English. So, as I said previously, I informed my line manager that I was ill, and considering leaving teaching. CONSIDERING. In a private letter.
This was then passed on to the head, who confronted me about it. He shouldn't even be aware of this yet, it was a private letter.
Anyway, they have now cancelled media studies next year on the assumption that I am leaving. They have nothing from me in writing at all.
What was much, much worse, was that a colleague of mine, a TA in the school (was previously a media teacher before becoming similarly burnt out) handed in her notice to go to work at another school with better pay. Head called her down to his office, and offered her my job as media studies teacher. They still have nothing from me in writing. So my job is being offered whilst I am still currently employed to teach it, with only the merest hint that I will be going.
Needless to say, she didn't take the job, and there was a whole other mess with that poor girl going.
Head has just been to see me this lunchtime to ask me to come to his office after school to discuss when I will hand in my notice. For heavens sake, he only knows about this because somebody essentially passed on my private letter regarding my health. He shouldn't even know about it yet. He also used the time to publicly "tell off" another member of staff in front of everyone in our staff room. This place...
No idea what I will say to him after school to be honest. I do NOT want to be pushed out early, as I won't be paid for the summer. And surely it's my business when I hand my notice in?!