Actually what I was meaning was that they are trying to keep on the right side of the law. They know they have a yellow card and can legally be self-employed so they don't want to take a job which they need to be employed for in case they get into trouble. What they don't understand is that most nannies wrt tax can't be self-employed. They think they're proposing a win-win situation but they're not, not through any intentional dishonesty but through ignorance.
The yellow-card/SE thing only applies to A2 nationals who cone with the colour coded worker registration certificates, hence they're particularly likely to propose this arrangement. A2 worker registration certificates
It's not at all about being above the law. Quite the opposite. It's about ignorance on their part and previous employers who've let them be SE.
And as I said other people are dishonest, implying that the previous statement wasn't at all about dishonesty.
At the simplest a nanny works for one family (or two families in a share) in their home, caring for those children only. More detailed: They are employed, have set hours, statutory holidays, sick pay and carry out duties directed by their employer.
Childminders work from their own home caring for children from as many different families as they want/their registration allows. They are able to choose their own rates, holidays, rules, routines and duties but don't get sick pay etc. They must be registered with OFSTED.