We have a "child free" wedding (grr) coming up next month. It is for a family member so we have to go. We will need to ask our live in nanny to look after DD overnight if she is free/wants to do so but she hasn't done this before for us so I wanted an idea of the going rates before discussing it with her. She does the odd bit of babysitting outside her hours for which we have agreed £10 per hour gross. Say we wanted her to do noon Saturday to noon Sunday, what should we expect to pay?
For context DD is used to the nanny putting her to bed and sleeps through about 50% of the time, the other 50% she normally wakes once but will be back asleep within about 10-20 mins. We live in outer London.