The DfE has re-published its 'guidance on full opening' with some new detail and clarifications, and under a new name: Restricting attendance during the national lockdown: schools.
What's new
Children with at least one parent or carer who is a critical worker can go to school if required This includes children who have another parent working from home There's no limit to the number of children of critical workers that can attend You can ask for evidence (like an ID badge or payslip) to prove someone is a critical worker Pupils struggling to engage in remote education may be classed as vulnerable and able to attend in person Nurseries, maintained nursery schools and nursery classes in school should remain open to all You're expected to allow all children to attend full time or their usual hours (but only vulnerable children and children of critical workers should attend on-site reception classes) Alternative provision and special