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OldGit said:6-7k is normally accepted as providing a representative random sample. However, it depends how the sample is selected, and whether or not it requires some demographic selection to be truly representative. We simplty don't know how it was done.
In the words of Vic Reeves: "94% of all statistics are wrong". :icon_bigg
They do explain how they collect the data:
http://www.roymorgan.com/resources/pdf/factsheets/UKFactSheet_A4scr.pdf