On May 10th, 2020 the Prime Minister announced a phased return of some children to school in England from June 1st. Schools have been closed to all but vulnerable and keyworker children since March 20th, meaning that most children have been educated at home for a period of 10 weeks, and some year groups are not expected to return to school until the autumn. Nevertheless, opening their schools to selected year groups (Nursery, Reception, Year 1 and 6 in primary schools and Year 10 and 12 pupils in secondary schools) as well as continuing on-site provision for vulnerable and keyworker children and providing distance learning for others is a considerable challenge for school leaders. In this report the authors set out initial findings on how prepared school leaders are for opening more fully, what challenges they face and what guidance and support they need. This report is based on findings from a national survey of 1,233 senior leaders in publicly-funded, mainstream primary and secondary schools in England. Responses between May 7th and 17th have been weighted by phase and free school meal (FSM) eligibility to provide a nationally representative picture. [For a summary report, "Schools' Responses to COVID-19: Key Findings from the Wave 1 Survey," see ED608586.]