From the link in the report
http://stakeholders.ofcom.org.uk/mar...gement-tracker
The study seeks to provide as comprehensive a dataset as possible. It includes both older children (12-15 year olds) and adults who use the internet less frequently to get a nationally representative sample of UK individuals aged 12+. This requires a very large sample size (4400 individuals), and a hybrid online and face-to-face survey methodology.
"Illegal" was in the view of the respondent - it was free do you think is was illegal.
The questionnaire is online as a PDF.