Matheu specialises in dealing with disputes involving tax issues, mainly disputes with HMRC.

He often works alongside a client’s existing advisors to help to manage and control the procedural aspects of the litigation process, to gather and prepare the client’s evidence and to analyse the opponent’s evidence, tailoring his role to what is needed in each case. He is highly regarded for finding pragmatic and cost-effective ways to deal with even the most complex tax disputes.

Matheu acts for private clients and businesses of all sizes from all sectors including IT and software, mechanical engineering, hospitality, food producers, pension providers, entertainment, aviation, professional sport, outsourcing, and natural resources.

In 2024 he was appointed as a Fee-paid Judge of the First-tier Tribunal, assigned to the Tax Chamber.