Home / People / Judith Aldersey - Williams
Portrait of Judith Aldersey - Williams

Judith Aldersey - Williams

Of Counsel

CMS Cameron McKenna Nabarro Olswang LLP
6 Queens Road
Aberdeen
AB15 4ZT
United Kingdom
Languages English, French
Competition

Judith Aldersey-Williams has over 25 years’ experience advising on competition and regulatory matters in the UK and now brings that experience to bear for her clients in the energy sector.

Her current main focus is the interaction of competition law and collaboration in the context of the current cost pressures faced by the industry and the new system of UK oil and gas regulation which requires the industry to collaborate to maximise economic recovery across the basin. 

With more than 450 energy and climate change lawyers, including over 100 partners, the CMS Energy and Climate Change practice is one of the largest of its kind in the world. Led from its centres of excellence such as London and Aberdeen, the practice works across 75 offices globally. Building on 40 years of experience advising on power, oil & gas and renewables through to energy disputes, emerging areas and Energy Transition, CMS is uniquely placed to ensure clients receive advice best suited to their commercial needs and to our collective future.

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"Always good and commercial legal advice and really good support."

Legal 500, 2020

"extremely helpful and pragmatic," adding that she is "very approachable and responsive."

Chambers, 2019

"a very smart lawyer"

Chambers 2018

Relevant experience

  • Oil & Gas UK on potential competition law implications of data sharing to optimise resource allocation on the UKCS.
  • Independent oil company on competition issues arising out of joint marketing or selling of NGLs.
  • Service company on competition issues arising out of club for drilling operations.
  • Multinational operator on competition issues in joint purchasing of logistics services in remote location.
  • Multinational on competition law implications of sharing of data in context of an area plan.
  • Infrastructure owner on competition issues arising out of dedication clause.
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Publications

  • 2021 - Thomson Reuters Practical Law Energy Global Guide Oil and Gas UK 2021.
  • 2018 - Chapters on competition law and Decommissioning Security in Oil and Gas Law – Current Practice and Emerging Trends, Gordon and Paterson, 3rd Edition, Dundee University Press.
  • 2016 - Default clauses in joint operating agreements: recent guidance from the English courts, International Energy Law Review.
  • 2016 - Chapter on Decommissioning Security in Decommissioning, ed Hammerson, Global Law and Business, 2nd Edition.
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Lectures list

  • Law Society of Scotland Oil and Gas Conference 2021 – Rights to oil and gas – Offshore and onshore UK Licensing and Liability.
  • UK Oil and Gas Law Course (CEPMLP and CMS Cameron McKenna), Banchory – November 2019 – Competition Law and Collaboration, Decommissioning and Decommissioning Security.
  • Oil & Gas UK Legal Conference 2018 – Decommissioning regulation update.
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Education

  • 1989 - Admitted as a Solicitor in England and Wales
  • 1987 - College of Law, Law Society Finals
  • 1986 - Kennedy Scholarship to Harvard Law School, LLM
  • 1985 - Cambridge University, BA in Law, 1st class
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Energy & Climate Change

Judith Aldersey-Williams is Of Counsel in the CMS Energy & Climate Change Team, with over 25 years of experience in upstream oil and gas contracts and regulation. Based out of the Aberdeen office, she advises energy industry clients in the UK and internationally on their joint venture agreements, transportation agreements, gas sales agreements and procurement 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 on competition/antitrust matters in the oil and gas industry. 

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. She regularly supports Oil & Gas UK on industry initiatives.

With more than 450 energy and climate change lawyers, including over 100 partners, the CMS Energy and Climate Change practice is one of the largest of its kind in the world. Led from its centres of excellence such as London and Aberdeen, the practice works across 75 offices globally. Building on 40 years of experience advising on power, oil & gas and renewables through to energy disputes, emerging areas and Energy Transition, CMS is uniquely placed to ensure clients receive advice best suited to their commercial needs and to our collective future.

more less

"Always good and commercial legal advice and really good support."

Legal 500, 2020

"extremely helpful and pragmatic," adding that she is "very approachable and responsive."

Chambers, 2019

"a very smart lawyer"

Chambers 2018

“Judith Aldersey-Williams is viewed by multiple interviewees as "at the forefront of complex industry legal issues," and receives particular praise for her handling of decommissioning matters. Recent highlights include assisting with exploration and production contracts, including farm-out arrangements, and mandates for service companies.”

Chambers, 2016

Judith Aldersey-Williams is viewed by multiple interviewees as "at the forefront of complex industry legal issues," and receives particular praise for her handling of decommissioning matters. Recent highlights include assisting with exploration and production contracts, including farm-out arrangements, and mandates for service companies.

Chambers UK 2015

Chambers UK 2014 says Judith “is a "strong name in the industry" and stands out for her work with Oil & Gas UK on decommissioning tax relief. Sources marvel at her intellectual prowess: "Judith is incredibly bright. For really complex problems she is the best, and has done an amazing job working on industry standards."

Chambers UK 2014

Outstanding

Legal 500, 2013

Relevant experience

  • Oil & Gas UK in negotiations with HM Treasury and HMRC for introduction of decommissioning relief deeds to provide certainty over decommissioning tax relief and their implications for decommissioning security.
  • Shell as operator of Subsea Well Response Project, a joint venture of nine multinational oil companies, on agreements with Oil Spill Response Limited for the development of equipment to respond to well control incidents worldwide.
  • TAQA representing a consortium of operators ("the Operational Gas Group") on a suite of contracts for purchase of fuel gas in Northern North Sea.
  • Oil & Gas UK on drafting of industry standard JOA and DSA.
  • BP on restructuring of contracts for the Foinaven Field.
  • Kellas Midstream on suite of agreements for the development of the Tolmount Field.
  • Major on decommissioning contracting strategy for significant portfolio of assets.
  • Independent on integrated services agreement.
  • Major oil companies on the drafting of decommissioning security agreements.
  • Multinational on a total facilities contract.
  • Major independent on competition issues arising out of joint marketing or selling of hydrocarbons.
  • Multinational on application of decommissioning legislation to UK wells and on issues relating to derogations from OSPAR.
  • Services company on development of standard service agreements.
  • Independent on sole risk issues under JOA.
  • Independent on risk issues arising out of contractual indemnity arrangements.
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Memberships & Roles

  • Trustee of the Energy, Mineral and Natural Resources Law and Policy Education Trust.
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Publications

  • 2021 - Thomson Reuters Practical Law Energy Global Guide Oil and Gas UK 2021.
  • 2018 - Chapters on competition law and Decommissioning Security in Oil and Gas Law – Current Practice and Emerging Trends, Gordon and Paterson, 3rd Edition, Dundee University Press.
  • 2016 - Default clauses in joint operating agreements: recent guidance from the English courts, International Energy Law Review.
  • 2016 - Chapter on Decommissioning Security in Decommissioning, ed Hammerson, Global Law and Business, 2nd Edition.
more less

Lectures list

  • Law Society of Scotland Oil and Gas Conference 2021 – Rights to oil and gas – Offshore and onshore UK Licensing and Liability.
  • UK Oil and Gas Law Course (CEPMLP and CMS Cameron McKenna), Banchory – November 2019 – Competition Law and Collaboration, Decommissioning and Decommissioning Security.
  • Oil & Gas UK Legal Conference 2018 – Decommissioning regulation update.
more less

Education

  • 1989 - Admitted as a Solicitor in England and Wales
  • 1987 - Law Society Finals, College of Law
  • 1986 - Kennedy Scholarship to Harvard Law School, LLM
  • 1985 - BA in Law, 1st class, Cambridge University, Cambridge
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The new Ver­tic­al Block Ex­emp­tion Reg­u­la­tion (VBER) and the new ac­com­pa­ny­ing Ver­tic­al Guidelines (VGL) were pub­lished on 10 May 2022. The new VBER will enter in­to force on 1 June 2022 and ap­ply for the next twelve years. The new VBER/VGL in­tro­duce sev

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08/09/2022
NSTA’s new guid­ance on Sup­ply Chain Ac­tion Plans
The North Sea Trans­ition Au­thor­ity (“NSTA”) re­cog­nised early in its ex­ist­ence that the oil & gas in­dustry’s sup­ply chain has a key role to play in sup­port­ing de­liv­ery of its Max­im­ising Eco­nom­ic...
14/04/2022
NSTA is­sues open let­ter to li­censees on ESG dis­clos­ure and re­port­ing
A re­cent area of fo­cus for the North Sea Trans­ition Au­thor­ity (“NSTA” – formerly the Oil & Gas Au­thor­ity) has been cor­por­ate gov­ernance and a drive to high stand­ards of com­pli­ance and gov­ernance...
21/03/2022
North Sea Trans­ition Au­thor­ity New Gov­ernance Guid­ance
Among the changes in­tro­duced in the North Sea Trans­ition Au­thor­ity (“NSTA”) Strategy[1] (which came in­to force on 11 Feb­ru­ary 2021) was a new “Cor­por­ate Gov­ernance” Sup­port­ing Ob­lig­a­tion. This...
01/02/2022
BEIS Con­sults on New Cli­mate Com­pat­ib­il­ity Check­point
As part of the North Sea Trans­ition Deal, aimed at sup­port­ing the UK’s oil & gas in­dustry through a peri­od of trans­ition to de­car­bon­ise North Sea pro­duc­tion and en­cour­age the fo­cus on “net zero”...
26/01/2022
Ju­di­cial re­view of Oil and Gas Au­thor­ity’s Strategy dis­missed
Throughout 2021, the Oil and Gas Au­thor­ity (“OGA”) faced a num­ber of leg­al chal­lenges from en­vir­on­ment­al cam­paign­ers. Per­haps the most sig­ni­fic­ant ex­ample was the ju­di­cial re­view chal­lenge to the...
12/10/2021
Green­peace’s ap­peal on the grant­ing of con­sent in re­spect of the Vor­lich...
En­vir­on­ment­al cam­paign­ers are in­creas­ingly tak­ing form­al steps through court pro­ceed­ings to chal­lenge oil & gas ex­plor­a­tion and activ­ity.  One re­cent high pro­file ex­ample has been Green­peace’s at­tempts...
28/09/2021
Oil and Gas Au­thor­ity pro­posed Gov­ernance Guid­ance and Con­sulta­tion
When the OGA first pro­posed new Sup­port­ing Ob­lig­a­tions per­tain­ing to gov­ernance in its con­sulta­tion on the OGA Strategy, there was a con­cern among re­spond­ents as to its value and pur­pose. Re­spond­ents...
09/08/2021
The OGA and ar­bit­ra­tion un­der the Mod­el Clauses
Two sig­ni­fic­ant is­sues for oil & gas in­dustry li­censees as re­gards chal­len­ging de­cisions or ac­tions by their reg­u­lat­or, the Oil & Gas Au­thor­ity (the “OGA”), arose re­cently in AT, DV, SD, HG v Oil...
28/06/2021
Col­lab­or­a­tion re­quire­ment in the UKCS oil & gas in­dustry - Stew­ard­ship...
Since its in­cep­tion the Oil and Gas Au­thor­ity (“OGA”) has con­sist­ently iden­ti­fied col­lab­or­a­tion as a key to min­im­ising costs and max­im­ising ef­fi­ciency and in­vest­ment in the UKCS. The OGA Strategy...
24/05/2021
High Court de­cision raises sig­ni­fic­ant is­sues over the in­ter­pret­a­tion of...
The re­cent de­cision in Apache UK In­vest­ment Lim­ited v Esso Ex­plor­a­tion and Pro­duc­tion UK Lim­ited [2021] EWHC 1283 (Comm) shows how dif­fi­culties can arise when com­plex stand­ard agree­ments are amended for...
19/05/2021
The OGA’s New De­com­mis­sion­ing Strategy
The UKCS in­fra­struc­ture is vast, com­pris­ing over 320 fixed in­stall­a­tions, 250 sub­sea sys­tems, 20,000km of pipelines and 7,800 wells. Not­with­stand­ing the in­creased fo­cus on the op­por­tun­ity to re­use and...
08/04/2021
The Cor­por­ate In­solv­ency and Gov­ernance Act 2020 and the Oil & Gas In­dustry
The Cor­por­ate In­solv­ency and Gov­ernance Act 2020 (“CIGA”) came in­to force on 26 June 2020 after an ac­cel­er­ated par­lia­ment­ary pro­cess, its main ob­ject­ive be­ing to as­sist busi­nesses to con­tin­ue trad­ing...