If you’ve spent the past few weeks wondering why Labour has focused on the economy, the NHS and borders without talking much about Brexit, look no further than the party’s director of strategy. Mattinson literally wrote the book on why Labour lost the Red Wall and has been critical in formulating the “hero voter” concept around which the party has structured its 2024 campaign. Having founded research group BritainThinks, Mattinson’s data expertise is something which Keir Starmer prizes highly. Since joining his top team in 2021, her priority has been winning back the working and lower middle-class voters in the North and Midlands that flipped to the Tories in 2019. Should they succeed in tempting them back, Mattinson is likely to stay on, with Starmer making the most of her experience working for past leaders including Tony Blair and Gordon Brown.