rning bodies and proprietors should ensure that staff have the skills, knowledge and understanding to keep looked after children safe. 190. In particular, they should ensure that appropriate staff have access to the information they need in relation to a child’s looked after legal status (whether they are looked after under voluntary arrangements with consent of parents, or on an interim or full care order) and the child’s contact arrangements with birth parents or those with parental responsibility. They should also have information about the child’s care arrangements and the levels of authority delegated to the carer by the authority looking after him/her. The designated safeguarding lead49 should have details of the child’s social worker and the name of the Virtual School Head (see para 194) in the authority that looks after the child. 191. A previously looked after child potentially remains vulnerable and all staff should have the skills, knowledge and understanding to keep previously looked after children safe. When dealing with looked after children and previously looked after children, it is important that all agencies work together and prompt action is taken when necessary to safeguard these children, who are a particularly vulnerable group. The designated teacher 192. Governing bodies of maintained schools and proprietors of academies must appoint a designated teacher50 and should work with local authorities to promote the educational achievement of registered pupils who are looked after. With the commencement of sections 4 to 6 of the Children and Social Work Act 2017, designated teachers have responsibility for promoting the educational achievement of children who have left care through adoption, special guardianship or child arrangement orders or who were ad