A note on the methodology of this tool
Underpinning the functionality of this tool is a ranking system that places each seat on a priority scale of 1-650. This is predominantly informed by how close a seat is based on an average of MRP polls, but there is also a significant amount of artificial adjustment to account for local contexts. For instance, the seat of the Speaker, Chorley, is our lowest-priority seat because convention dictates that he stands unopposed, and so there is no risk of a Tory winning. Likewise, any seats that have no Tory/DUP contention are pushed towards the bottom of the priority scale. Simply put, the higher the chances of unseating the incumbent Tory, or of a successful Tory challenge to a progressive incumbent, the higher the ranking of the seat. This then allows us to differentiate between seats to inform our users.