And say, she's contracted to work for 8 hours a day, on a salary and not an hourly rate, but you come home on occasion 15-30 minutes early, and say 'feel free to go!' Or, if she says 'is there anything else I can do for you?' And you say 'no, all fine, see you tomorrow!'
Would you then tell her that you are going to be taking those 'early finishes' from her final payslip?
What about if the contract says '1 nights babysitting shift per week of approx 3 hours, to be agreed in advance. However sometimes we may not use these'.
Would you then expect to subtract the weeks not used, even if the nanny was available to babysit, against the holiday the nanny has outstanding?