This is straight from my contract:
"Hours of Work - You are expected to manage your working hours so as to fulfill the requirements and objectives of your job and as such you will have no standard working hours. You will, however, normally be expected to attend on a daily basis, Monday to Friday. In addition, you are expected to be available outside these hours, including at weekends, as the state of work requires."
It's like the complete opposite of zero hours.....but just as vague!