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Multilevel Regression and Poststratification modelling. Apparently.
It's a model that works on a constituency by constituency basis that looks at demographics as well as polling information.
It's explained here:
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Multi-level regression with post-stratification
https://en.m.wikipedia.org/wiki/Multilevel_regression_with_poststratification
A refined model for analysing the effect of polls at a constituency level.
What is MRP?