As a nanny you may have completed this survey for many years, or this may be your first time. The survey asks questions about where you are working (demographic data), a little about yourself such as asking which age range you fit in and your gender, plus how many hours a week you work. Then the key information, how much you are paid per week. Not sure why monthly salary is not asked, I would have thought that would have been better but maybe they feel that more people know their weekly salary.
In 1998, a daily nanny (live out) working in the home counties (so I expect that means Surrey, Berkshire, Buckinghamshire, Hartfordshire, Essex, Kent, Sussex) was getting an average of £213 net per week (gross figure unknown).
By 2012 that figure had risen to £428 net per week (just under £29,000 gross per year). So over the years salary has doubled but over that time a lot of things have been affected by inflation. So perhaps looking back just a few years is better, in which case 2011 £421, 2010 £422, 2009 £380. So generally going up but with a dip in 2010.
Will 2013 be another dip or are nanny wages on the rise? You can help find out by completing the survey, saying what salary you are currently earning. Survey results are expected to be published late January / Early February 2014 on the NannyTax website and also in publications like Nursery World.