I work in a private school. They are currently trying to make me work excessive hours which the union say is against the law. The school says everyone does it so I should too. I have had a very stressful meeting about it with my head where I left in tears. I am planning on leaving this academic year and I would get the union in but I'm frightened of a negative reference if I do that. I know it's against the law to give me a bad reference but I'm sure there are ways of communicating these things to prospective employers which will then cause them to not employ you. Do I just roll over and take it to ensure my escape?