I'm trying to think what type of person might want this job I've just seen advertised.
It's an afterschool nanny for a 9 year old and 11 year old. Five days per week 2.30pm to 7pm in term time including school pick up by car and cooking dinner, and then full time in school holidays.
Who would it suit? 
Obviously someone not bothered about eating dinner in the evening. And able to chop and change from part time hours (and part time salary) to full time at the drop of a hat. If it's private school they would be working full time for about a third of the year.