International arbitration

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Providing high quality financial, accounting and economic analysis to support quantum assessment, evidence-gathering and handling, and enforcement and asset recovery services in complex international arbitration disputes.

Collaborating with you and your legal advisors, we support on a wide range of matters from quantifying losses due to a breach of contract through to asset expropriation, providing a trusted team with experience in advisory and testifying capacities.

Our testifying experts are externally recognised by Lexology, Chambers and Global Arbitration Review and have proven track records. They have given evidence numerous times in many different arbitration forums, including the LCIA, ICC, ICSID, PCA, DIAC, SCC and SIAC. Our experts are supported by an experienced forensic team.

Proven experience

Our professionals have been expert witnesses on claims worth multiple US$ billions and are externally recognised.

International reach

We are part of a global forensic community spanning 25 countries.

Wider industry expertise

We can draw on the sector expertise of the wider UK firm, which comprises over 5,000 people, to meet your needs.

Get in touch

Chris Tune

Director, Head of Arbitration

Contact Chris Tune Learn more about Chris Tune

Grant Thornton is Lexology Index recommended for Arbitration in 2026.

“He is incredibly calm, composed and authoritative during cross-examination”

Chris Tune Feedback from Lexology research

“Philippa is a thoughtful, energetic and sensible expert”

Philippa Hill Feedback from Lexology research

Manufacturing dispute

Challenge

We acted as independent expert for the Claimant in a breach of contract dispute between the manufacturer of battery units and their customer.

Solution

We assessed the profits that would have made under the contract had it been fulfilled, as well as reviewing the additional costs incurred due to the breach of contract.

Result

The Respondent did not instruct an expert, so we addressed their points on our written reports in correspondence, and our expert gave oral evidence during the hearing.

African telecoms dispute

Challenge

We acted as independent expert for the Respondent in a claim brought by the operators of a mobile telecoms network following the removal of their operating licence.

Solution

Following a partial award by the sole arbitrator the experts were required to update their assessments of damages and worked collaboratively to produce a joint model.

Result

The original damages claim was in excess of US$3bn, however the damages in the final award amount to US$48.5m, plus interest and costs.

Natural resources dispute

Challenge

We acted for the Respondent in an arbitration claim relating to alleged breaches of obligations under early-stage exploration and development licenses in the oil and gas industry.

Solution

We valued the licenses, incorporating the risk that the project would not succeed given its early-stage of development and the prevailing market conditions at the valuation date.

Result

Our expert gave oral evidence during the hearing. The partial award by the sole arbitrator was issued in favour of the Respondent.