Does the perfect in-house tax team exist, and can it give a commercial advantage? Leading UK tax directors (pictured below, clockwise from top left) Ian Brimicombe (AstraZeneca plc), Samar Farooq (Care UK), Glyn Fullelove (Informa plc), Paul Morton (Reed Elsevier Group plc) and Jennie Rimmer (Aspen Group) consider the question, as Helen Blenkinsop reports