Research is an integral part of the UCL's Early Career Framework (ECF) programme. This is the second report in a series of research publications from the UCL Centre for Educational Leadership-led project, The Impact of the ECF Programme on the Work Engagement, Wellbeing and Retention of Teachers: A Longitudinal Study, 2021-2026. ECF reform lies at the heart of the Department for Education's teacher recruitment and retention strategy. The purpose of this mixed methods research is to assess the extent to which (and the ways in which) early career teachers' (ECTs') and their mentors' learning experiences with the ECF programme influence their decisions to stay in teaching, move schools, or leave the profession. All ECTs and mentors in the UCL-led ECF programme were invited to complete a survey about their learning experiences with the ECF programme between June and October 2022. Of the approximately 12,000 invited ECTs and mentors, over 1,700 responded (response rate of 14%). The acquired sample of respondents is representative of national ECT and mentor populations in terms of gender, ethnicity, school phase and contract type, giving us confidence about the relevance and representativeness of our ECTs' and mentors' reported learning and career experiences to those of their peers nationally.