Hannah is a Partner and Solicitor Advocate in the international arbitration and public international law group.
Hannah advises clients globally on complex issues relating to both commercial and investment arbitration, enforcement of awards and judgments, public international law and strategic dispute resolution.
Hannah has acted as counsel in ad hoc commercial arbitrations and proceedings under the auspices of major arbitral institutions, including the ICC, LCIA, and SCC. She has acted as counsel for both investors and States on a number of investment treaty claims under the ICSID and UNCITRAL Rules and advises clients on investment structuring. She also has experience in advising on a range of other public international law matters, including territorial and maritime boundaries, law of the sea, international environmental law, treaty negotiation, and immunities. She works across a number of sectors, including energy, mining, pharma/life sciences and financial institutions and banks.
Hannah is listed as a Next Generation Partner in the International Arbitration and Public International Law categories in Legal 500 UK and is ranked in the International Arbitration and Public International Law categories in Chambers UK 2026.
Hannah is a Member of the City of London Law Society Arbitration Committee and a Practice Fellow at the British Institute of International and Comparative Law.
Experience & capabilities
Selected matters
Investment Treaty Arbitration and Public International Law
- advising a commercial client on the rights and obligations of States to take action to protect offshore infrastructure against the activities of hostile States, including under UNCLOS
- advising a commercial client on potential actions against a State in connection with the destruction of infrastructure arising from a drone strike
- representing a global integrated energy company in treaty negotiations with two States, and advising on other international law and disputes issues in relation to the development and exploitation of a cross-boundary natural gas discovery
- acting for the Republic of Azerbaijan and its national oil company in ICSID arbitration proceedings brought against it by UK and Georgia-based investors under a BIT and the Energy Charter Treaty in connection with their withdrawal from a major oil field and related contractual issues (ICSID Case No. ARB/20/20)
- acting for Nord Stream 2 AG in its claim against the European Union under the Energy Charter Treaty, relating to the impact of new European Union legislation on a major gas pipeline, and the first investment arbitration brought against the European Union (PCA Case No. 2020-07) (until Feb 2022)
- acting for a South East Asian State in a threatened claim under the ASEAN Treaty regarding its non-renewal of a gas distribution licence
- acting for Vedanta Resources PLC on a claim against India under the UK-India Bilateral Investment Treaty arising from the imposition of retroactive tax (PCA Case No. 2016-05)
- acting for investors in an investment treaty claim under the ECT and various BITs
- advising an oil and gas company on application of the EU Blocking Regulation in the context of contracts related to Iran
- advising a Chinese shipping company on the application of the EU Blocking Regulation in respect of contracts related to Iran
- advising an international aviation company regarding international law remedies under investment treaties, WTO treaties, and various other treaties concerning the actions of Russia and other sovereign states further to Russia's invasion of Ukraine and Russia's counter-sanctions, including bringing an investment treaty claim against a North African State
- acting for Biwater Gauff (Tanzania) Limited on its claim against the United Republic of Tanzania under the UK-Tanzania BIT (ICSID Case No. ARB/05/22)*
- advising the Southern African Customs Union on a dispute with the EU under the EU-SADC Economic Partnership Agreement
- advising a number of utility companies and infrastructure funds on investor-State arbitration and investment structuring in a scenario of future nationalisation, including questions as to availability and scope of treaty protections and related quantum issues
- advising an international mining company regarding its rights under investment treaties and the European Convention on Human Rights concerning the threat to its investment arising from Russia's invasion of Ukraine
- advising an international investment bank regarding its rights under international law concerning a potential threat to its investment in Ukraine arising from Russia's invasion
- advising an oil and gas company on application of international law in UK domestic court proceedings in response to a question raised by the UK Supreme Court
- advising a pharmaceutical company on its potential rights under investment treaties in respect of anticipated interference with its IP rights
- advising a multinational oil and gas company on issues relating to arbitration and the immunity of international organisations in connection with a gas project in west Africa
- advising an international financial institution concerning its options under public international law, including international investment, EU and WTO law, for bringing proceedings against a State, including to challenge its exercise of extra-territorial jurisdiction
- advising an international organisation on the interaction between its immunities and UK employment and data protection law, and its immunities before the English courts
Commercial Arbitration
- acting for a major Korean bank in a Hong Kong seated, UNCITRAL Rules arbitration on the recovery of a substantial investment in a Jersey based derivative-linked securities fund
- acting for a real estate investment fund in a Swiss seated ICC arbitration concerning default under a facility agreement and guarantee
- acting for a pharmaceutical company in a Swiss seated ICC arbitration in connection with the termination of a supply and distribution agreement in the Middle East
- acting for a multinational logistics company in a London-seated LMAA arbitration under a terminal services agreement
- acting for a West African state in an LCIA arbitration concerning termination of a mining licence
- acting for an energy company in a dispute in a LCIA-MIAC arbitration in relation to a power purchase agreement
- acting for the subsidiary of a multinational telecommunications company in an LCIA arbitration arising out of the sale of its majority stake in an Africa-based telecommunications company
- acting for a consumer goods company in a post M&A dispute under the ICC Rules
- advising on disputes aspects of a joint venture for the design, development and delivery of next-generation combat aircraft
- advising a major state-owned national oil and gas corporation in connection with a dispute with a partner in connection with an LNG project
- advising a multinational chemicals and technology company in a £500 million dispute and threatened arbitration under the SCC Rules
- acting for a Swedish multinational packaging and processing company in an LCIA arbitration*
- acting for a pharmaceutical company on multiple Bermuda Form arbitrations against its insurers and in related proceedings in the High Court and Court of Appeal*
- advising a defence contractor in a dispute with a JV partner*
- acting for a private equity group in an SCC arbitration under Swedish law against a multinational provider of power and automation technologies arising from a sale and purchase agreement*
*experience gained prior to joining HSF Kramer
Sectors
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