Source ~~ Begin Quote ~~
From 1 September 2008 you are exempt from compulsory registration if you:
provide care only between the hours of 6pm and 2am on domestic premises (baby sitting arrangements). Domestic premises can be your own home or someone else?s home, but not the home of the parents of the child.
~~ End Quote ~~
So to me that looks as though a babysitter working at the home of the child (or put another way, "the home of the parents of the child"), is NOT exempt from Compulsory Registration.
I contacted Ofsted asking for this to be clarified. I got back a response which also did not seem to be correct, as it mentioned an exemption covering 2pm to 6am. So I have asked them to try again.
I think they are trying to say that a nanny working anytime between 2am and 6pm is not exempt - though I feel they fall under voluntary registration (not compulsory). Childcare between 6pm and 2am has in the past been unregulated... and I don't expect that to have changed. It will certainly be very interesting, if Ofsted are now wanting every babysitter to be registered!