[http://www.legislation.gov.uk/uksi/1999/584/regulation/2/made National Minimum Wage Regulations 1999 s2(2)a]
Now the drafting of this legislation is IMHO not very good, and some parts could definately lead to a challenge by a nanny (particularly (2)(a)(ii) regarding 'leisure activities') but I am not aware that any such case has come to court.
(2) In these Regulations ?work? does not include work (of whatever description) relating to the employer?s family household done by a worker where the conditions in sub-paragraphs (a) or (b) are satisfied.
(a)The conditions to be satisfied under this sub-paragraph are?
(i)that the worker resides in the family home of the employer for whom he works,
(ii)that the worker is not a member of that family, but is treated as such, in particular as regards to the provision of accommodation and meals and the sharing of tasks and leisure activities;
(iii)that the worker is neither liable to any deduction, nor to make any payment to the employer, or any other person, in respect of the provision of the living accommodation or meals; and
(iv)that, had the work been done by a member of the employer?s family, it would not be treated as being performed under a worker?s contract or as being work because the conditions in sub-paragraph (b) would be satisfied.
(b)The conditions to be satisfied under this sub-paragraph are?
(i)that the worker is a member of the employer?s family,
(ii)that the worker resides in the family home of the employer,
(iii)that the worker shares in the tasks and activities of the family,and that the work is done in that context.