Populus interviewed at least 750 adults residents (18+) in 18 constituencies local to Heathrow Airport by telephone and face-to-face between 20 May 2019 and 20 August 2019. In total, 13,501 residents were interviewed.

Results were weighted to be demographically representative of all adults in each constituency, and were also weighted by 2017 General Election vote to be politically representative of all adults.