Lib Dem Pupil Premium works
One of the successes of the Liberal Democrats in coalition was the introduction of the Pupil Premium in 2011. Recent research shows that it has had an impact on "levelling up" disadvantaged students.
Here is a quote from their report "After 2010, the segregation of long-term disadvantaged pupils and their peers reduced in Years 1 and 6, and their attainment improved relative to their peers at ages 7 and 11. However, assessments changed after 2014 and this complicates the pattern. A regression model suggests that relative attainment for poor pupils improved markedly in the Pupil Premium era, even in regions like the North of England which have faced criticism for apparently "failing" their poor pupils. We argue for retaining the Pupil Premium policy."
The full report can be read here