Vassia's practice has a focus on international trade and commodities. She advises and represents clients, mainly commodity trading houses and banks, on both dispute and transactional matters relating to the purchase, sale and transportation of commodities, particularly food and feedstuffs, vegetable oils, oilseeds, cotton, biofuels, coal, crude oil and petroleum products. She has considerable experience in arbitration before major trade associations and international bodies, as well as in High Court litigation, including before the appellate courts. She also regularly advises clients in the execution of physical commodity contracts with a view to early dispute resolution. Vassia is recognised as a leading individual in Commodities in both Legal 500 and Chambers, as follows:

Chambers UK 2024: “"Vassia is an extremely good lawyer. She's accessible and responsive."

Chambers UK 2022: "She is an excellent lawyer who provides high-level legal advice and combines great analysis with a practical sense".

Chambers UK 2019: “she is super user-friendly and really good in the physicals space”.

Legal 500 UK 2019: “has a very calm manner, which instils the utmost confidence in the advice being given”.

Listed as a Leading Lawyer in The Legal 500 UK for Commodities: physicals, 2015-2019, and Commodities disputes, 2020 - 2022.

Legal 500 UK 2016: referenced as “successfully acted for client in Supreme Court”.