Schools have issued letters to inform parents of the new rules; you will have to apply for a place and prove you meet the criteria before sending your child into school. You will be invited to apply if you work in a critical worker role or your child meets the vulnerable child criteria.
More information is available from the link below, and from your child’s school: gov.uk/government/publications/closure-of-educational-settings-information-for-parents-and-carers/closure-of-educational-settings-information-for-parents-and-carers