This document summarizes data on social mobility in the UK. It shows that many positions of power and influence in Britain are held by people who attended private schools, with rates as high as 71% for senior judges. It also provides data on gaps in educational attainment and outcomes between children from wealthy versus poor backgrounds. For example, only 43.8% of students in Norwich achieve 5 A-C grades at GCSE compared to 75.9% in St Albans. The document calls for initiatives to improve early childhood education, school quality in disadvantaged areas, apprenticeships and career progression to improve social mobility.