With his renowned approach for thoroughness and attention to detail, Andrew has appeared in every domestic tribunal from the Magistrates Court, through to the House of Lords. Andrew acted for the Appellant in what is still the leading case on the imposition of Hospital Orders in conjunction with mandatory life sentences (R v Drew).

He boasts a heavy criminal caseload including cases of the highest complexity and seriousness such as multi-handed conspiracies to supply class A drugs, complex fraud cases, murder and rape cases. He is regularly instructed by the Crown Prosecution Service's Complex Casework Unit to handle difficult and high profile multi-handed conspiracies including cases with international jurisdictional issues. Andrew appears as a Leading junior in cases for both the Crown and the Defense.

Andrew also has a particular specialism in the field of public interest immunity, a field in which he is viewed as one of the leading practitioners on the Wales Circuit and one in which he has represented almost every local authority within Wales including presenting arguments regarding public interest immunity in the Court of Appeal.