James has appeared in many leading cases including:
R v IRC ex p. Unilever (Judicial review of HMRC)
IRC v Dawson (Trust residence)
Wensleydale's Settlement Trustees v IRC (Double taxation treaties and trusts)
R v Dimsey & Allen (Family home and benefits in kind; HMRC prosecution)
Phizackerley v HMRC (Nil rate band discretionary trusts)
Burns v HMRC (Transfer of assets abroad)