Oliver Millington was called to the Bar in 2003. He is an experienced family practitioner with a particular interest in children law. The focus of Oliver's family practice is on public law proceedings in which he represents local authorities, parents, extended family members, prospective adopters and children via their guardians. He is regularly instructed in cases concerning serious non-accidental injury, sexual abuse and complex mental health issues, as well as general neglect cases. Oliver is used to dealing with international issues concerning jurisdiction and placements abroad.

Oliver is a contributing author to The PLO Explained, a practitioners' handbook to the Public Law Outline 2014 published by 9 Gough Square. He regularly gives seminars and practical court training to lawyers and social workers.

Oliver is on the Executive Committee of the Association of Lawyers for Children. He is also a member of the Family Law Bar Association.