What does your contract say? Mine said, 3 months notice for the Autumn term and 4 months for the spring and summer term. In my current job (in an FE college), I have to give 3 months notice. E.g. Had I handed in my notice on 28th November, my leaving date would have been 1st March. When I worked in a school, I handed in my notice at October half term and my leaving date was 31st December. Hope this helps! Merry Xmas to you too!