The collection of information is subcontracted to a fieldwork agency. Until 2014 (Waves 1-5) it was NatCen Social Research, for Waves 6-8 it was Kantar Public. For the current Waves 9 -11 contract, the fieldwork is conducted by Kantar Public, with part of the interviewing being done by NatCen. You can read more about the interview process in the Interview Process section of the Main Survey User Guide.
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