Telephone +44(0)1925 230700 Email
Telephone +44(0)1925 230700                              Email

Executive Team

Mike Thirsk - Managing Director

Mike is an experienced design office Manager that set up Tenet as a specialist engineering design consultancy providing design services to the Nuclear Industry and Public Sector.

Aidan McManus - Operations Director

Aidan has a background of electrical engineering and project management within the defence, maritime and nuclear industries. This is based on a Royal Navy career working on military radar systems and engineering design within the nuclear sector.


Starting out as an Artificer Apprentice in 1998, Aidan completed his engineering course at HMS Collingwood before going on to manage his own radar section on numerous frontline warships. A number of deployments then followed, including trips to the Mediterranean and the Gulf. After completing his Senior Rates Command Course with distinction, he went on to conduct his officer training at Britannia Royal Naval College in 2006, where he graduated as the top warfare officer in his entry.


Upon leaving the Armed Forces, Aidan was offered a position within the Tenet design office, where he took on the role of Design Team Leader. At the same time he also studied with the Open University to gain qualifications in Project Management. A spell working for a company producing coastal surveillance systems, as their Senior Project/Sales Engineer, allowed Aidan to develop his project management skills, while also gaining exposure to the commercial world of sales, marketing and customer relations. Aidan's current role as Tenet's Operations Director enables him to align the company's business practices with the principles of improving efficiency and ensuring procedural compliance to deliver Client's projects on time and to high quality standards.


Aidan lives in Liverpool with his wife and two children and, in his down time, can be found hiking or skiing as frequently as possible, often with a camera strapped to his hand.

Keith Howbrigg - Commercial Director

Keith is Tenet's Commercial Director with thirty-five plus years experience in high technology industries, with experience of design, production management, QA and Health, Safety & Environment. PC literate, proficient in a range of IT applications. Industrious, conscientious and diligent, self-motivated with a manner suited to bringing out the best in the team. Works effectively with quality management systems. Has the ability to control and integrate outputs from sub-contractors. Adaptable to varied working environments. Competent in budgetary control, agreeing and meeting the requirements of clients; the planning and successful execution of work programmes, together with a working knowledge of ISO 9001 Quality Management Systems and Occupational Health and Safety practices.

IOSH Member 145913

Specialties: Delivery of Projects, meeting time, cost and quality constraints.

Latest News

As a design consultancy business, Tenet has always focused on developing the next generation of engineers entering our industry and addressing the widening skills gap caused by an aging demographic of engineers approaching retirement age. The importance that the business placed in this issue resulted in the company establishing our own internal apprenticeship scheme more...

Meet The Team

Building relationships with our customers is a core value for our business. Nothing helps more then being able to put a face to a name. You can learn a bit more about the management team here.

What We Offer

Tenet is a specialist CE&I and Mechanical engineering design consultancy, providing niche design and technical services to a variety of industry sectors. You can find out more about our capabilities here.

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