The £12.04 /hr equates to £9.83 p/h plus 22.5% shift allowance
Need to be flexible: "However, at peak times you may be required to work additional hours or at quieter times you may be required to work less than 38 or 31 hours a week.
This does not affect your salary which is paid consistently at 38 or 31 hours per week despite the hours you may work".