I am currently working under someone who is doing exactly that. I am, in effect, doing their job for them! I know I should step back but I think the only ones who would suffer are the pupils. I am also keen to show that I have initiative so I can progress but it is getting beyond a joke now. It irritates me to know that their salary is probably nearly double mine with all the 'hats' that they wear. The headteacher knows but does nothing about it! Any ideas what I should do?