Populus interviewed at least 1,000 adult residents (18+) in nine constituencies local to Heathrow Airport by telephone between 22 July and 7 September 2014.
An additional 666 residents were interviewed in the London Borough of Hillingdon (across two constituencies: Ruislip, Northwood and Pinner; and Hayes and Harlington) in order to provide 1,670 interviews in the borough. In total, 9,670 residents were interviewed.
Results were weighted to be demographically representative of all adults in each constituency and borough. Constituency results were also weighted by past vote to be politically representative of all adults.