For anyone sitting the G671 retake in May, here is the full 2007 Carol Vincent study on social class and childcare, a version of which provides the exam's pre-release material. Reading the full thing isn't essential for exam success, but is still useful in gaining a fuller understanding of the objectives and findings of the study and more detail on the methods used...
...Reading through the pre-release material, it seems clear that Social Class will be the theme of the exam. The study uses semi-structured interviews, but there is very little detail on these. It seems much more likely the 52 mark question will focus on the sampling techniques used.