After a bit of a search, through a private advert, we've found what seems to be a really good part-time nanny (2 days a week).
The only thing is that she wants to be paid in cash and says this is how she has always worked.
Is this common? We paid our previous part-time nanny through BACS.
Would it cause problems in any way - for us or her? Perhaps invalidate public liability nanny insurance? I am a bit concerned.