My friend and I work. She's a part time supply doctor and I'm a teacher (tutor from home). We have both found having an au pair works better for flexibility of childcare. I've been really unlucky recently- with two only lasting 6 months and one shortly after that having been found by me to be restraining my daughter by the wrists. She didn't last long!
I found a new au pair and was scared that she would talk to my friend's au pair and hear that the others have found easier jobs in central London and become concerned that I asked the nutty one to leave. We live in the sticks.
So, I let my au pair (lovely girl) settle in with us for a few weeks and told my (nosy) friend I was using a babysitter.
Her au pair met mine and my friend was prying for info. I told her the truth and that I relied on my au pair for my livelihood. Feel bad to have lied but wanted a clean break from the au pair chat thing.