The government plan is for the full return of all pupils from September 2020: https://www.gov.uk/government/publications/actions-for-schools-during-the-coronavirus-outbreak/guidance-for-full-opening-schools.

School employers and leaders are required by law to think about the risks the staff and pupils face and do everything reasonably practicable to minimise them, recognising they cannot eliminate the risk of coronavirus (COVID-19). School employers must therefore make sure that a risk assessment has been undertaken to identify the measures needed to reduce the risks from coronavirus (COVID-19) so far as is reasonably practicable and make the school COVID-secure. 

This risk assessment is available to view under Coronavirus on our website.