Operational Support

Our extensive experience means our Subsea Engineering team can provide the best-possible operational support solutions – all up to relevant international and industry standards.

Rapid Response Operational Support

  • 24/7 support service
  • Client equipment storage
  • Critical electrical and hydraulic components
  • In-house manufacture and test facilities
  • Rapid turnaround on subsea electrical and hydraulic flying leads
  • Fully kitted mobile workshop for nationwide site support

Offshore Testing

  • Fault diagnostics
  • Insulation Resistance (IR)
  • Time Domain Reflectometry (TDR)
  • Repair and replacement of sensors
  • Electrical and hydraulic umbilical connections and terminations
  • VLF power testing - TDR / OTDR

Offshore Support

  • Qualified offshore personnel
  • Hydraulic, electrical, fibre optic testing or fault diagnostics
  • Management of your offshore equipment (Reelers, Umbilicals, Jumpers) with convenient quayside delivery (fully prepared and tested)
  • Safety permit system assistance

Hydraulic Flushing and Testing

  • Rapid turnaround on time-critical work
  • In-house hyperbaric, flushing and pressure-testing facilities
  • A range of control fluids

Subsea Cable Splicing and Termination

We understand that reliable cable splicing and termination design is critical for the correct installation and long, reliable service life of subsea cables and umbilical’s. To maximise quality control, we manufacture complete mechanical assemblies including electrical, fibre and hydraulic connectors. We also offer water blocks, armour and strain terminations, and bend restrictors.

Strategic Spares Management

As part of our strategic approach to supporting you, we store and manage supplies of critical spares including connectors and sensors. Alongside strategic spares, we offer Legacy Locker, our open industry portal for re-manufacturing and recycling and upcycling of subsea equipment.

Engineering design

Operational support

Subsea connectivity systems

Subsea distribution & accumulation

Subsea transformers

Subsea control manifolds

Subsea in-line splice assemblies

High voltage connections

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  • Registered in Scotland No : SC645331

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Accreditations & Affiliations

J+ S Subsea AGCC Logo 2021
Decom Mission Logo
J+S Subsea Forth & Tay Logo
J+S Subsea GUH Logo
J+S Subsea OEUK Logo
J+S Subsea Areg Logo
J+S Subsea OGV Logo
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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
  • info@jands.co.uk
  • +44 1224 773435
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