This document summarizes the work of the UK Government Digital Service (GDS) in transforming digital government services in the UK. The key points are: 1) GDS pioneered new agile, user-centered approaches to developing digital public services that have been adopted around the world and saved the UK government £4.1 billion over 4 years. 2) GDS established new standards, governance, and centralized technology functions to shift government services to be digital by default and continually improved based on user needs and data. 3) By taking new approaches to policymaking, delivery, procurement, and working with suppliers, GDS helped modernize how government operates and delivers public services digitally.