Judith Aldersey Williams#4916

Judith Aldersey Williams

Judith Aldersey-Williams has 25 years' experience as a commercial lawyer in London and Aberdeen. She advises energy industry clients in the UK and internationally on commercial contracts, including joint operating agreements, major infrastructure projects, gas sales agreements, supply and service contracts and has worked on projects from Angola to Trinidad (she's still hoping for a project in Zambia). She also advises on regulatory issues and competition/antitrust matters. She has worked closely with Oil & Gas UK on a variety of industry initiatives including the industry standard Decommissioning Security Agreement (DSA) and Joint Operating Agreement. Her career highpoints have been advising Oil & Gas UK in its negotiations with the UK Government over the introduction of ground-breaking contracts to guarantee tax relief for decommissioning and advising the Subsea Well Response Project, a group of nine multinational oil companies, on contracts for the development and funding of innovative equipment which is now available to allow operators around the world better to respond to well control incidents like Macondo. Recommended by Legal 500 for oil and gas and competition law, she is also rated Band 1 by Chambers 2018 for Oil & Gas in Scotland which states 'Judith Aldersey-Williams is described as "a very smart lawyer" by sources. She is known by those in the market for her high quality work on industry-wide initiatives and regulatory matters.'
Contributed to


Area Plans under the NSTA Strategy—Competition Law Issues
Area Plans under the NSTA Strategy—Competition Law Issues
Practice notes

This Practice Note analyses the potential risks related to exchanges of commercially confidential information in the UK oil and gas (O&G) sector within the context of the NSTA Strategy (published under the title ‘OGA Strategy’ in 2020), in particular with regards to information as to proposed future investments and future production in order to produce an Area Plan, and it further identifies how such exchanges may be conducted in a manner which is consistent with UK and EU competition laws.

Third-Party Access to the Upstream Oil and Gas Infrastructure
Third-Party Access to the Upstream Oil and Gas Infrastructure
Practice notes

This Practice Note provides an overview of the third party access (TPA) regime in place in the in the United Kingdom Continental Shelf (UKCS). It introduces both the UK and EU legislative framework underpinning the TPA regime, as well as a comprehensive overview of the North Sea Transition Authority’s (NSTA) Guidance on Disputes over Third-party Access to Upstream Oil & Gas Infrastructure. The NSTA was formerly known as the Oil and Gas Authority. It also touches on potential issues of competition law that may arise when dealing with TPA on the UKCS.

Practice Area


  • Consulting Editorial Board

Qualified Year

  • 1989


  • TBC


  • BA Clare College, Cambridge (graduated 1985)
  • LLM Harvard Law School (graduated 1986)

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