I have worked in my current role for 8 years, with no real problems. New boss is nasty, intimadating, and when I raised managing my time for work tasks, was told to do it at home if I could not fit it into my weekly hours. She has picked on various members of staff, and now it is my turn. She has accused me of all sorts and has denied having previous conversations with myself. I have just gone off sick with occupational stress due to her and I can see no way to go back. There is no option of moving within the organisation as our jobs are specialised. I am due to see my union, however they are usally pretty useless. I was wondering what are the grounds for constructive dismissal please.