I'm a Psychology teacher with nine years' experience but I'm looking at applying for a job that would require that I teach biology. I have an A level in biology and there's a significant amount of biological material in what I'm teaching now, but I'm not convinced that the transition would be as easy as it seems to be for biology teachers coming over to my subject. Would you want me?! What could I reasonably offer, if anything, or should I stick to my own subject? Please be gentle in your replies.