Engineering solutions for the safe, efficient and cost-effective decommissioning of subsea infrastructure.

J+S provides specialist decommissioning support services for operators, contractors and offshore service companies managing ageing subsea assets. Our engineering team supports the planning, modification, testing, isolation, recovery and retirement of subsea control systems, power distribution equipment and associated offshore infrastructure.

By combining practical offshore experience with specialist subsea engineering expertise, we help clients reduce risk, minimise costs and maximise value throughout the decommissioning process.

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Supporting Safe & Efficient Decommissioning

As offshore assets approach the end of their operational life, operators face increasingly complex technical, operational and regulatory challenges.

J+S supports decommissioning programmes through specialist engineering, testing, refurbishment and operational support services that help ensure safe and efficient project delivery.

Our experience includes temporary control systems, communication solutions, equipment modifications, offshore testing, asset recovery and life extension strategies that enable operators to safely transition assets through the decommissioning phase.

Our Decommissioning Support Capabilities

1 J+S Subsea Case Custom TSPCU for Decommissioning 3

Decommissioning Engineering

Specialist engineering studies and technical solutions supporting decommissioning projects and offshore asset retirement.

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Temporary Control Systems

Design and deployment of temporary subsea control and monitoring solutions supporting decommissioning operations.

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Communications & Control Support

Solutions to maintain critical communications and control functionality during late-life operations and asset retirement.

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Offshore Testing & Diagnostics

Electrical, hydraulic and fibre optic testing supporting decommissioning campaigns and intervention activities.

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Equipment Refurbishment

Refurbishment, recertification and modification of equipment required to support decommissioning operations.

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Asset Recovery & Reuse

Evaluation and recovery of equipment suitable for refurbishment, recertification or future reuse.

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Key Decommissioning Services

J+S supports operators throughout the decommissioning lifecycle including:

  • Decommissioning engineering studies
  • Temporary control system design
  • Equipment modifications
  • Control module support
  • Offshore testing and diagnostics
  • Cable and umbilical support
  • Hydraulic isolation solutions
  • Communication system support
  • Equipment refurbishment and recertification
  • Asset recovery programmes
  • Strategic spares management
  • Offshore operational support

Supporting Asset Reuse & Circular Economy Initiatives

Decommissioning projects present opportunities to recover, refurbish and repurpose valuable subsea equipment.

Through our refurbishment expertise and Legacy Locker™ initiative, J+S helps operators identify opportunities to extend equipment life, reduce waste and maximise value from recovered assets.

Services include:

  • Asset Assessment

Technical evaluation of recovered equipment.

  • Refurbishment & Recertification

Returning equipment to service-ready condition.

  • Obsolescence Resolution

Replacing obsolete components and restoring functionality.

  • Equipment Reuse

Supporting future deployment opportunities through refurbishment and recertification.

Featured Decommissioning Projects

Real-world examples of how J+S decommissioning projects deliver results for our clients.

10 J+S Case Study SCM Communications for Decommissioning 1

Manual Subsea Control Module

Development of a cost-effective manual subsea control solution supporting decommissioning activities.

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SCM Communications

Engineering support to maintain subsea control module communications during late-life asset operations.

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Umbilical Disconnection Project

Specialist engineering and operational support for subsea infrastructure disconnection activities.

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Why Choose J+S?

he engineering partner you can rely on for practical, cost-effective subsea solutions.

Practical Decommissioning Experience

Engineering solutions developed around real offshore operational challenges.

Subsea Control Systems Expertise

Specialist knowledge of ageing subsea control infrastructure and associated equipment.

Refurbishment & Reuse Capability

Helping maximise value from recovered subsea assets.

Offshore Operational Support

Qualified personnel supporting intervention, testing and decommissioning campaigns.

Independent Engineering Solutions

Flexible support tailored to project requirements and asset conditions.

Supporting the Full Asset Lifecycle

Unlike many engineering providers, J+S supports subsea infrastructure throughout its entire lifecycle.

From design and installation through operational support, life extension, refurbishment and eventual decommissioning, our team provides practical engineering solutions that help operators maximise value while maintaining safe and reliable operations.

This lifecycle perspective enables us to identify opportunities to reduce costs, minimise waste and improve project outcomes throughout the decommissioning process.

Planning a Decommissioning Project?

Whether you require engineering support, temporary control solutions, offshore testing or asset recovery expertise, our team is ready to help.

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Contact Our team
Mark Patterson Non-Executive Chair

Mark Patterson

Non-Executive Chair

Mark’s career spans five decades, marked by entrepreneurial success and visionary leadership across various sectors, including offshore marine technology, subsea oil and gas, green energy storage, and more.

With a track record of leading businesses through start-up, growth, acquisitions, and transformations, Mark’s expertise lies in strategic decision-making, mentoring, and brand management.

He has overseen multimillion-pound projects, pioneered new technologies, and guided companies to international recognition, such as the underwater GPS NASNet®.

His leadership style is direct, inclusive, and based on trust, empowering teams to excel.

Mark’s achievements include managing high-profile global companies, such as Balmoral group, Nautronix and Well-Safe Solutions, where he played key roles in groundbreaking projects. Global explanation and high growth.

Outside of business, Mark is deeply committed to family and charity work, with a passion for shooting, boating, and car collecting. As an experienced executive, he remains dedicated to fostering success by identifying future opportunities and mentoring the next generation of leaders.

Mark Patterson Non-Executive Chair

Mark Patterson

Non-Executive Chair

Mark’s career spans five decades, marked by entrepreneurial success and visionary leadership across various sectors, including offshore marine technology, subsea oil and gas, green energy storage, and more.

With a track record of leading businesses through start-up, growth, acquisitions, and transformations, Mark’s expertise lies in strategic decision-making, mentoring, and brand management.

He has overseen multimillion-pound projects, pioneered new technologies, and guided companies to international recognition, such as the underwater GPS NASNet®.

His leadership style is direct, inclusive, and based on trust, empowering teams to excel.

Mark’s achievements include managing high-profile global companies, such as Balmoral group, Nautronix and Well-Safe Solutions, where he played key roles in groundbreaking projects. Global explanation and high growth.

Outside of business, Mark is deeply committed to family and charity work, with a passion for shooting, boating, and car collecting. As an experienced executive, he remains dedicated to fostering success by identifying future opportunities and mentoring the next generation of leaders.

Phil Reid Managing Director J+S-Subsea

Phil Reid

Managing Director

Phil has worked in the energy industry for over 25 years. He started his career with Kvaerner FSSL progressing through a variety of roles in subsea engineering, from manufacturing to leading some of their most complex projects all over the world. He worked with the original J+S for a period before moving on to Genesis Oil and Gas as a Subsea Controls Engineering consultant; during that period, he was seconded to Centrica Energy (now Spirit Energy) which led to a permanent role as Lead Subsea Controls & Umbilical Engineer for Developments, Capital Projects and Operated Assets. For almost a decade Phil successfully delivered Capital Projects from concept right through to project close out whilst also looking after the running of their subsea assets.

As part of J&S Subsea limited, Phil oversees the day-to-day operations and will grow the business both in the UK and globally. 

James Morris

Engineering Director

James’s career started when he joined the Royal Navy from school as an Artificer Apprentice. After a 5-year Marine Engineering Apprenticeship he served in surface ships HMS Glamorgan, HMS Edinburgh, and HMS Glasgow and at Rosyth as part of an engineering support team. 

Moving into the Energy Industry in 1992, over the next 26 years he gained a wealth of experience within large and small companies on operation, design and project management of subsea control systems and equipment. This period started with several years as a Project Engineer for a family run hydraulic services company Grampian Hydraulics followed by 5 years as a Support Engineer at Kvaerner Oilfield Products.  James joined RRC Controls Services ltd in 2001 before finally moving to J+S Ltd in 2010. At J+S his dedication and technical capabilities were rewarded with several promotions until becoming a member of the management buyout team. 

He has designed an extensive array of subsea equipment from basic cable penetrators to complete subsea control modules. 

James thrives on providing solutions for client’s problems. 

As Engineering Director, James will ensure that the company provides clients with timely, cost effective and technically sound solutions and services. 

Matthew Blair

Executive Chairman

Matt Blair is Executive Chairman of J+S Subsea which was formed in October 2020 through a management buyout of the Subsea Engineering Division of Systems Engineering and Assessment Ltd.

With J+S Subsea and SEA for over 14 years, Matt has a wealth of industry knowledge and expertise.

Previously an Electronics Engineer with Ferranti Computer Systems Ltd specializing in sonar and submarine command systems, Matt moved into hydrographic survey working with Subsea7, Tritech, and CDL before joining J+S Subsea.

He was Vice Chair of the Decom Leadership Group of Decommission and in that role, he facilitated industry and academic studies on potential for reuse and repurposing of decommissioned equipment. He is still actively involved with the reuse agenda through Decommission and OEUK.

Although not part of day-to-day operations, Matt stays close to company strategic matters and is seeking further opportunities to update and transfer Energy technologies and products into the Marine Renewables markets and help to develop the broader circular economy.

Contact Us

  • J&S Subsea Limited
  • The Lombard Centre
  • Kirkhill Place
  • Dyce
  • AB21 0GU
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