Well I employed two nannies over a period of 14 years. In that time I travelled all over the UK and all over the world. But between my husband and I, the number of times our nanny had to give up any of her time can be counted on the fingers of less than one hand. And I often work evenings untill 10.30pm.
Yes, things happen. And if you're a surgeon/part of a surgical team/a doctor as Heswall appears to be, there will be times when emergencies happen. But you are one of a partnership as you have a DP.
There is no excuse for thinking you can own a nanny in the way that you imply. Even if they live-in, they are allowed to have their own time and their own lives!
It's selfish and completely lacking in respect.
Communication and planning are key in this regard, as are laying down the ground rules before you employ a nanny and before you take on the position as a nanny.
It's bloody hard work looking after children all day - the hours of a nanny are unlike any other - and let's not forget that it's often impossible for them to have a break or a lunch break either!