The key workers list:
This list published by the Department for Education and the Cabinet Office outlines those children who are eligible to receive priority care from schools and education settings as at least one of their parents' work is considered critical to the Covid-19 response. Those able to access these provisions also includes vulnerable students, such as those disabled, supported by care, with specific safeguarding or child protection plans and those with education, health and care (EHC) plans.
https://www.gov.uk/government/publications/coronavirus-covid-19-maintaining-educational-provision
Advice for parents and carers over the closure of educational settings:
Plans to continue to support pupils receiving free school meals:
https://www.gov.uk/government/news/plans-set-out-to-support-pupils-eligible-for-free-school-meals