Analysis by FocalData from multiple research vendors, including Opinium, 1 March - 1 April 2019.  Sample: 9,500 adults from 632 constituencies across Britain.  Findings based on preferences expressed. Findings derived using multilevel regression and post-stratification (MRP) methodology, which is proven to produce very accurate constituency level findings.  FocalData is a consumer analytics platform that uses machine learning to predict public opinion.

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