Location: Wokingham and Reading area, Berkshire.
Pay Rate: £18.00 per hour.
Shifts: 12-hour rotating 4 on / 4 off shift pattern, consisting of 2 days & 2 nights, then 4 days off.
We are the National Energy System Operator (NESO) — an independent, impartial, and expert organisation at the centre of Great Britain's energy system. We are driven by collaboration, innovation, and a shared purpose: to ensure everyone has access to clean, affordable, and reliable energy.
At NESO, we value inclusivity, diversity, and belonging. We build strong relationships, empower one another, and ensure every voice matters. Together, we are shaping the future of energy and supporting communities across the nation.
As a Site Protection Supervisor, you will play a critical role in leading security operations within a Critical National Infrastructure (CNI) environment.
This is a position of responsibility and leadership, where you will oversee the delivery of security services, manage incidents, and ensure the highest standards of safety, compliance, and professionalism are maintained at all times.
You will act as the key operational lead on shift, supporting and directing officers, making decisions in real time, and ensuring that site security remains effective, resilient, and compliant.
- Supervise and coordinate day-to-day security operations across all site functions
- Lead and direct incident response, ensuring effective control, escalation, and resolution
- Maintain real-time situational awareness and proactively identify risks or vulnerabilities
- Oversee access control processes, ensuring compliance with site security procedures
- Monitor CCTV, alarm systems, and control room activities
- Manage and support Site Protection Officers, ensuring performance, conduct, and professionalism
- Ensure all incidents, activities, and system faults are accurately recorded and reported
- Deliver structured briefings, handovers, and operational updates
- You will lead security operations protecting critical infrastructure supporting the UK's energy system
- Your decisions will directly impact site safety, resilience, and operational continuity
- You will operate in a high-security environment requiring strong leadership and accountability
We are seeking experienced and capable security professionals with strong leadership skills.
- SIA Front Line Door Supervisor & CCTV Operator License.
- Proven experience in a supervisory role within security.
- First Aid at Work qualification (or willingness to obtain).
- Full UK Manual Driving License.
- British citizen with a UK Passport or hold dual Nationality.
- Lived and worked in the UK for the past 5 years.
- Minimum of 3 GCSEs including English and Maths at grade C/4 or above (or equivalent).
- Experience managing incidents and leading teams.
- Experience within government or critical infrastructure environments.
- SC Clearance - must be obtained as a condition of your employment.
- Experience using systems such as CCTV, access control platforms and incident reporting tools.
- Fluent in verbal and written English with excellent communication and interpersonal skills.
- Strong leadership and team management skills.
- Good knowledge of security operations, CCTV, access control, and incident response.
- Ability to manage conflict and make decisions under pressure.
- Competent in report writing and incident documentation.
- Strong working knowledge of health & safety and compliance requirements.
- Excellent IT skills and a good understanding of all MS Office applications.
- Confident leader with the ability to motivate and guide others.
- Professional, disciplined, and accountable.
- Calm and decisive in high-pressure situations.
- Strong attention to detail.
- Approachable and supportive management style.
- High level of integrity and discretion.
You will be an experienced security professional with the ability to lead from the front. You will be confident in managing people, handling incidents, and making decisions in a fast-paced environment.
You will demonstrate strong leadership, professionalism, and the ability to maintain control and composure in challenging situations.
You will receive structured site-specific training and ongoing development, including:
- Operational procedures and security protocols
- Security systems (CCTV, access control, alarms)
- Conflict management and de-escalation techniques
- Fire safety and First Aid
- Ongoing professional development and career progression within Mitie
All successful candidates will be required to complete:
- Fitness medical (including eyesight, hearing, and fitness test)
- Drug and alcohol screening
- Security vetting and clearance (SC)
Our recruitment process is fair, transparent, and based on merit. It is designed to assess your suitability against the requirements of the role at each stage.
To be considered, applicants must successfully complete each stage of the process outlined below:
- Eligibility Screening: You will be required to complete a series of eligibility questions to confirm that you meet the minimum requirements for the role. Successful candidates will progress to the application stage.
- Application & Situational Judgement Test (SJT): You will complete an application form, including role-specific questions and a Situational Judgement Test (SJT). The SJT assesses your responses to workplace scenarios and behaviours relevant to the role. A minimum pass mark must be achieved to progress.
- Application Sift: Your application will be reviewed against the role criteria to determine suitability for the next stage.
- Virtual Interview: Successful candidates will be invited to attend a virtual interview to further assess skills, experience, and behaviours.
- In Person Pre-Employment Checks: This stage includes:
- Competency test (including eyesight, hearing, and fitness test)
- Drug and alcohol screening
- Security vetting and clearance (SC)
Please note that you must successfully pass each stage to progress to the next.
