You need to separate two different things. The temporary point is just for this term, until December 2005. As a result, it has no validity beyond that date, and no protection since it is for a fixed period. The school will be creating a new staffing structure for 2006 which will have to consider whether the teaching and learning responsibility grades are to be used to provide subject leadership. You can ask what will happen to your subject.
If you have a question for John Howson, please email firstname.lastname@example.org