I have worked in the same school for many years and have had enough.
New head has just about done me in. Half the staff have left, he undermines me at every opportunity, endless paper pushing excercises, monitoring book scrutinies, data that doesnt improve, 11 hour days without a break, hours and hours of extra work in my own time blah blah blah. So sad- it used to be such a lovely place. 
I have heard about a job coming up locally soon that would suit me down to the ground and would be in a very good position to get (not in a school- specialist teacher post.)
I am thinking about starting to put my CV together but havent had to do this for years.
It's years since I applied for a job and want to make sure I have a very strong application. Any tips for a really good supporting letter to go into my application? I want to ensure it's not too waffly!
One more thing- will my head be contacted before any interviews for a reference or is this asked for once the job is offered?