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Your nearest office: Potters Bar (UK HQ)


Specialist Personnel

O’Neill & Brennan supply specialist personnel to first-tier contractors and subsidiaries across the UK, delivering staffing solutions to the power generation, Nuclear, Renewable Energy, New Build and Petrochemical sectors.

Working with an experienced and reliable partner to take care of your outage work requirements, is absolutely paramount. We support our clients during this process, through the effective management of planned outages or Supporting your core work force , covering pre-outage work, outage execution and post-outage evaluation.

Security Clearance

We view security as a fundamental component of recruitment in this area. That is why our in depth understanding and expert application of nuclear SQEP and clearance processes offers full compliance and conformation to changing industry regulations.

O’Neill & Brennan have 10 Authorised signatories throughout the company who are trained and authorised to carry out the vetting process.


Guide candidates through Disclosure Baring Service process

Verify Identity

We use the latest identity verification techniques

Work History

Certify employment / unemployment or education for the last three years

Access Team

Complete Baseline Standard Verification Record document to be sent directly to access team

Counter Terrorism

Complete Annex N for Counter Terrorism Clearance


Maintain aftercare to continue with ongoing personal security

The Highest Quality of Candidate

CTC clearance is carried out in house enabling personnel to work on Nuclear Sites, giving our workforce the benefit of working on non-nuclear and nuclear site.

We continually develop and improve our assessment processes to match the needs of our clients, and by using this experience we are able to provide the highest quality of candidates for any type of position, covering:

Quantity Surveyors
Project Engineers
Mechanical Design Engineers
Facilities Managers
EC&I Maintenance Technicians
Semi Skilled Operatives
Structural Engineers
Shift Operator Technicians
Field Service Technicians
Site General Managers
Planning and Scheduling Engineers
Mechanical Fitters
Design Managers
Procurement Managers
Senior Project Managers
Project Managers
Shift Engineers
Mechanical Craftsmen
Industrial Cleaners
Mechanical Engineers
Electrical Engineers

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