Siobhan D. Neill

Acted for Octopus Energy as an interested party in a judicial review challenge related to the transaction by which Octopus acquired Bulb Energy from administration (R (British Gas Trading Ltd and E.On) v. Secretary of State for Energy Security and Net Zero [2025] EWCA (Civ) 209).

Acted for one of the world’s largest bunker suppliers and traders in oil products in relation to four parallel proceedings in the English High Court, ad hoc arbitration, Liberian court, and BVI court in relation to a multimillion-dollar dispute regarding the sale of oil products.

Acted for international energy company in a US$90 million LCIA and ICC arbitration concerning different licence agreements for seismic data in Africa in relation to ‘change of control’ provisions.

Acted for independent power producer in US$400 million ICC arbitration in relation to termination and force majeure issues arising out of long-term gas purchase agreement.

Advised Spanish contractor on a dispute in relation to an EPC contract in connection with offshore wind farm.

Acted for offshore drilling contractor in LMAA arbitration against South Korean shipbuilder in relation to US$750 million claim relating to the delay, additional costs, and expenses incurred in the construction of four semi-submersible rigs; included acting in the UK High Court (Technology & Construction) on Daewoo Shipbuilding and Marine Engineering Company Limited v. Songa Offshore Equinox Ltd [2020] EWHC (TCC) 2353 in the related challenge under sections 68 and 69 of the Arbitration Act 1996.

Acted in the Commercial Court on Single Buoy Moorings Inc. v. Aspen Insurance UK Ltd [2018] EWHC (Comm) 1763 in relation to disclosure and privilege in the context of a US$1.5 billion dispute concerning a mobile offshore production unit in the North Sea.