Which?'s local data is based on analysis of the Which? Consumer Insight Tracker. Which? surveyed 12,500 people throughout 2015 and asked about their consumer concerns and experiences.
Estimates of sentiment were calculated for each 2011 Output Area Classification group, extrapolated down to individual output areas, and averages calculated for each constituency and region.
Please note: These statistics are estimates, and are indicative of the sentiment and behaviour of households within each constituency.