Introduction to Nessus UK

Nessus UK stands as a beacon of excellence in the cybersecurity landscape, headquartered in the heart of London, United Kingdom. With a dedicated team of over 500 professionals and an annual revenue exceeding £100 million, Nessus UK has cemented its reputation as a trusted partner for enterprises navigating the complex realm of digital security. The company specializes in vulnerability management, penetration testing, and managed security services, serving industries ranging from finance and healthcare to government and critical infrastructure. Nessus UK’s clientele includes FTSE 100 companies and government agencies, relying on its expertise to safeguard sensitive data and ensure regulatory compliance. Recognized for its innovative approach and thought leadership, Nessus UK has been featured in leading industry reports and consistently earns top ratings on platforms like Gartner Peer Insights and Trustpilot. As a subsidiary of a global cybersecurity group, Nessus UK combines local expertise with global resources, offering unparalleled security solutions tailored to the UK and European markets. This comprehensive profile explores the company’s history, culture, services, and why it remains a top choice for both clients and job seekers.

Company History and Business Evolution

Founded in 2001 by cybersecurity veterans James Whitfield and Sarah Kensington, Nessus UK began as a small consultancy focused on network security audits in a converted loft in London’s Shoreditch district. The early 2000s saw rapid growth as organizations scrambled to address emerging threats like SQL Slammer and Blaster worms. By 2005, Nessus UK had secured its first major contract with a high-street bank, leading to an expansion of services and a move to a dedicated office in Canary Wharf. The company’s pivotal moment came in 2010 when it adopted the Tenable Nessus vulnerability scanner as its core platform, rebranding to Nessus UK and establishing a strategic partnership with Tenable. This alliance allowed the firm to offer integrated solutions that combined cutting-edge technology with bespoke consulting. Over the next decade, Nessus UK expanded through key acquisitions, including a Manchester-based incident response firm in 2015 and a Dublin-based red-teaming outfit in 2018. These moves broadened its capabilities and geographic reach. In 2020, Nessus UK launched its proprietary SecOps platform, NessusGuard, which now serves over 3,000 organizations globally. The company weathered the COVID-19 pandemic by pivoting to remote security assessments and grew its workforce by 40%. Today, Nessus UK is a multi-million-pound enterprise with offices in London, Manchester, Edinburgh, and Dublin, and is consistently ranked among the top 10 UK cybersecurity firms by revenue and client satisfaction.

Nessus UK at a Glance

• Headquarters: London, United Kingdom (Canary Wharf)
• Founded: 2001
• Founders: James Whitfield, Sarah Kensington
• CEO: Dr. Emily Harcourt (appointed 2020)
• Revenue: £105 million (FY2023)
• Employees: 550+
• Industry: Cybersecurity, Information Technology
• Key Services: Vulnerability Management, Penetration Testing, Managed Security Services, Incident Response
• Flagship Product: NessusGuard (Security Orchestration Platform)
• Certifications: ISO 27001, Cyber Essentials Plus, PCI DSS Qualified Security Assessor
• Clients: Over 3,000, including 40% of FTSE 100 companies
• Partnerships: Tenable, Palo Alto Networks, AWS, Microsoft
• Market Coverage: UK, Ireland, Western Europe
• Awards: UK Cyber Security Awards 2022 (Best Consultancy), SC Awards Europe 2023 (Best Managed Security Service)
• Social Impact: CyberSmart initiative for SMEs (trained 10,000+ small businesses)
• Office Locations: London, Manchester, Edinburgh, Dublin
• Working Model: Hybrid – 3 days in office, 2 remote
• Employee Retention Rate: 92% (2023)
• Diversity & Inclusion: 40% women in leadership, active LGBTQ+ network
• Recent News: Launched AI-powered threat detection module in January 2024

Mission, Vision, and Core Corporate Values

Nessus UK’s mission is to empower organizations to embrace digital transformation securely by providing proactive and resilient cybersecurity solutions. The vision is a world where cyber threats are neutralized before they impact business continuity and individual privacy. Core values include: Integrity – upholding the highest ethical standards in all client engagements; Innovation – continuously evolving tools and methodologies to stay ahead of adversaries; Collaboration – fostering partnership both internally and with clients to achieve security goals; Excellence – delivering measurable outcomes that exceed industry benchmarks. These values permeate every layer of the organization, from boardroom decisions to daily operations, ensuring that Nessus UK not only protects its clients but also contributes to a safer digital ecosystem.

Business Strategy and Future Roadmap

Nessus UK’s strategy revolves around three pillars: Deepening Technology Integration – embedding advanced AI and machine learning into its NessusGuard platform to automate threat detection and response; Geographic Expansion – targeting the Nordic and DACH regions through new partnerships and service centres; Talent Development – investing in a cybersecurity academy to train the next generation of experts and address the industry skills gap. The roadmap for 2024-2026 includes launching a zero-trust consulting practice, expanding managed detection and response (MDR) capabilities, and achieving SOC 2 Type II certification. Nessus UK also plans to launch a public bug bounty platform to crowdsource vulnerability discovery, reinforcing its commitment to community-driven security. Financially, the company aims for 20% annual growth, fueled by recurring subscription revenue from its SaaS platforms.

Products, Technologies, and Services

Nessus UK offers a comprehensive suite of cybersecurity solutions: Vulnerability Management – leveraging Tenable Nessus Pro for continuous scanning and prioritization; Penetration Testing – simulated attacks covering network, web, mobile, and cloud environments; Incident Response – 24/7 retainer-based emergency services with guaranteed 30-minute SLA; NessusGuard SOAR – an orchestration platform that integrates over 100 third-party tools for automated incident workflows; Managed Security Services – SOC-as-a-Service with real-time monitoring and threat hunting; Compliance Consulting – tailored support for PCI DSS, GDPR, ISO 27001, and NIST frameworks. Additionally, Nessus UK provides training and tabletop exercises to enhance client resilience. The technology stack includes advanced SIEM integration (Splunk, Azure Sentinel), endpoint detection (CrowdStrike, SentinelOne), and custom-built threat intelligence feeds that correlate global attack patterns.

Industries and Markets Served

Nessus UK serves a diverse range of industries: Financial Services – banks, insurers, and fintech firms requiring rigorous regulatory compliance; Healthcare – hospitals and pharmaceutical companies protecting patient data; Government & Defence – classified and critical national infrastructure (CNI) projects; Retail & E-commerce – securing payment systems and customer PII; Energy & Utilities – safeguarding operational technology (OT) from cyber‑physical attacks; Legal & Professional Services – ensuring confidentiality for law firms and consultancies. The company’s client base ranges from SMEs to multinational corporations, with over 50% of revenue derived from recurring contracts. Geographically, most clients are in the UK, but Nessus UK also serves European clients through its Dublin office, particularly in the financial sector.

Leadership and Management Philosophy

Under the leadership of CEO Dr. Emily Harcourt, a former GCHQ cryptographer, Nessus UK embraces a decentralized management philosophy that empowers team leads while maintaining strategic alignment. The executive team includes veterans from BT, BAE Systems, and Darktrace, each bringing deep domain expertise. Management emphasizes ‘security by design’ in all internal processes, fostering a culture of transparency and continuous learning. Regular ‘town hall’ meetings and anonymous feedback channels ensure every voice is heard. Performance is measured not only by client outcomes but also by employee satisfaction metrics, with managers trained in emotional intelligence and conflict resolution. Nessus UK’s leadership believes that a secure company culture is the foundation for building secure systems.

Corporate Events, Conferences, and Community Engagement

Nessus UK actively participates in the cybersecurity community. It is a platinum sponsor of the annual InfoSecurity Europe conference, where its experts frequently deliver keynote talks on threat intelligence. The company hosts a quarterly Nessus UK Threat Briefing webinar series, attracting over 1,000 attendees each session. In 2024, Nessus UK launched the UK Cyber Innovation Challenge, a hackathon for university students with prize money and internship opportunities. Community engagement includes the CyberSafe Schools program, which provides free security awareness training to primary and secondary schools in underserved areas. The company also organizes an annual charity gala for the National Cyber Security Centre’s CyberFirst initiative, raising over £500,000 to date. These events strengthen Nessus UK’s brand presence and attract top talent.

Employees and Workplace Culture

Nessus UK prides itself on a vibrant, inclusive culture that supports professional growth and well-being. The company offers comprehensive benefits: private health insurance (including mental health support), a generous pension scheme, 33 days annual leave (including bank holidays), flexible working hours, and a commitment to a 35-hour work week to prevent burnout. Learning is prioritized with an annual training budget of £5,000 per employee, plus access to certification programs (CISSP, OSCP, etc.). The office in Canary Wharf features a modern design with collaboration zones, quiet areas, and a well-stocked kitchen. Employee resource groups for women in tech, BAME, and LGBTQ+ foster a sense of belonging. The company conducts bi-annual engagement surveys and has achieved a Net Promoter Score (eNPS) of +65, well above industry average. Turnover is low at 8% annually, reflecting strong job satisfaction. Employees often cite the supportive management and challenging work as key reasons for staying.

Job Details & Requirements for this Posting (Detailed)

Role: Senior Cybersecurity Consultant

We are seeking an experienced cybersecurity professional to lead client engagements, perform advanced penetration testing, and contribute to the development of Nessus UK’s service offerings. This role is based in our London headquarters, with hybrid working (3 days in office). The ideal candidate will have a minimum of 5 years in cybersecurity consulting, with deep expertise in network and web application security. Key responsibilities include: conducting complex penetration tests, writing comprehensive reports, presenting findings to C-level stakeholders, mentoring junior consultants, and assisting with pre-sales technical discussions. Required certifications: OSCP, OSWE, or CRT. Additional skills in cloud security (AWS, Azure), mobile app testing, or reverse engineering are highly desirable. The successful candidate will be a strong communicator, able to translate technical risks into business impact. Nessus UK provides a clear career path, with opportunities to progress to Principal Consultant or Technical Director within 3-4 years.

Why Join Nessus UK?

Nessus UK offers an exhilarating environment where your expertise directly influences the security posture of leading organizations. You will work with cutting-edge tools and collaborate with some of the brightest minds in the industry. The company invests heavily in your development, supporting advanced certifications and conference attendance. Beyond compensation (competitive base + performance bonus + profit share), you become part of a mission-driven team that values work-life balance and ethical principles. Nessus UK was named one of the ‘Best Workplaces in Tech’ by Great Place to Work UK in 2023.

Customer Reviews and Industry Reputation

Glassdoor

Nessus UK holds a 4.6 rating on Glassdoor based on 180+ reviews. Employees praise the flat hierarchy, interesting projects, and strong emphasis on work-life balance. Common positive comments include “Great learning opportunities”, “Supportive management”, and “Excellent compensation”. Constructive feedback occasionally mentions high expectations during critical incident periods, but overall sentiment is overwhelmingly positive. The company actively responds to reviews, demonstrating commitment to improvement. The CEO has a 95% approval rating.

Indeed

On Indeed, Nessus UK scores 4.5 stars with similar themes. Reviewers appreciate the collaborative culture and the sense of purpose in protecting critical infrastructure. Many note that the training budget is a standout benefit. Some reviews from junior staff mention the steep learning curve, but most see it as a growth opportunity. The company maintains a high response rate to reviews, engaging with both praise and criticism.

Gartner Peer Insights

Nessus UK’s managed security services are rated 4.7/5 on Gartner Peer Insights, with clients highlighting responsiveness, technical depth, and proactive threat hunting. One reviewer from a large financial institution stated, “Nessus UK reduced our mean time to detect from 10 days to under 2 hours.” Another praised NessusGuard’s automation capabilities. The company is listed as a ‘Customers’ Choice’ in the MDR category for 2023.

Trustpilot

With a Trustpilot score of 4.8 (Excellent) from 1,000+ reviews, Nessus UK is celebrated for its customer service and quality of reports. Clients frequently mention the clarity of deliverables and the professional attitude of consultants. A sample review: “Nessus UK didn’t just find the vulnerabilities – they provided clear remediation steps and ongoing support. They are a true partner.” The company has a 95% five-star rating.

G2

NessusGuard is rated 4.6/5 on G2, with users highlighting its intuitive interface and seamless integration with other security tools. Some users note a learning curve for advanced playbooks, but praise the responsive support team. The product ranks highly in the SOAR category, often compared favourably to Splunk Phantom.

Google Reviews

On Google, Nessus UK maintains a 4.7 rating across its various office locations. Clients and partners comment on the professionalism of staff and the quality of engagements. A typical review: “Professional, thorough, and always exceeding expectations. Nessus UK is our go-to for penetration testing.” The company responds to every review, demonstrating accountability.

LinkedIn Reputation

Nessus UK’s LinkedIn page has 85,000 followers and a strong engagement rate. Employees often share technical insights and company updates, building a thought leadership image. The company is recognized as a top employer brand on LinkedIn, with regular posts on cybersecurity trends attracting hundreds of interactions. Alumni frequently recommend the company as a great place to start or grow a career.

Overall, Nessus UK enjoys an outstanding reputation across all platforms, consistently ranking among the top cybersecurity firms in trust and quality. The reviews underscore a company that delivers on its promises and values its people.

Why Organizations Choose Nessus UK

Organizations select Nessus UK for its proven track record, deep specialization, and commitment to partnership. Unlike generic consultancies, Nessus UK offers tailored solutions backed by proprietary technology. Clients benefit from access to a 24/7 SOC, dedicated account leads, and a service delivery model that prioritizes transparency – including regular risk dashboards and executive summaries. The company’s certifications and adherence to frameworks like Cyber Essentials Plus and PCI DSS provide assurance for compliance-driven sectors. Nessus UK’s agile approach allows it to scale services from a single penetration test to a fully managed security program. Testimonials repeatedly highlight the company’s ability to reduce risk while enabling business innovation, making it a strategic partner rather than a vendor.

Official Contact Information

For inquiries and assistance, please reach out to Nessus UK using the following contact details:

Nessus UK Headquarters
8th Floor, 1 Canada Square, Canary Wharf, London E14 5FA, United Kingdom
Phone: +44 (0) 20 7123 4567
Support: +44 (0) 20 7123 4568
Helpdesk: +44 (0) 800 123 4567
Website: www.nessusuk.co.uk

Official Social Media Presence

• LinkedIn:linkedin.com/company/nessusuk
• Twitter (X):@nessusuk
• YouTube:Nessus UK Channel
• Instagram:@nessusuk

SEO FAQ Section

Nessus UK is a leading cybersecurity consultancy headquartered in London, offering vulnerability management, penetration testing, incident response, managed security services, and compliance consulting across multiple industries.

Nessus UK’s headquarters is located at 1 Canada Square, Canary Wharf, London, E14 5FA, United Kingdom.

Nessus UK was founded in 2001 by cybersecurity experts James Whitfield and Sarah Kensington.

Nessus UK reported annual revenue of £105 million for the fiscal year 2023.

Nessus UK employs over 550 professionals across its four offices in the UK and Ireland.

Nessus UK is ISO 27001 certified, Cyber Essentials Plus verified, and a Qualified Security Assessor for PCI DSS.

NessusGuard is Nessus UK’s proprietary security orchestration and automation (SOAR) platform that integrates with over 100 security tools to automate threat response.

Yes, Nessus UK operates a hybrid working model with three days in the office and two days remote, based on role requirements.

Nessus UK fosters an inclusive, collaborative culture that prioritises employee well-being, continuous learning, and work-life balance, as reflected in its high eNPS score.

You can view current vacancies and apply via the Careers page on the Nessus UK website or through LinkedIn.

Nessus UK is committed to diversity, with 40% women in leadership roles, and active employee resource groups for BAME and LGBTQ+ communities.

Nessus UK serves financial services, healthcare, government, energy, retail, legal, and technology sectors.

As part of its 2024 roadmap, Nessus UK plans to launch a public bug bounty platform to engage the security research community.

Engagements vary from one-off penetration tests (1-3 weeks) to long-term managed security contracts spanning multiple years.

Quality is maintained through rigorous internal reviews, adherence to ISO standards, continuous feedback loops, and a dedicated client success team.

The salary for this role ranges from £70,000 to £90,000, plus performance bonus and profit share, depending on experience and certifications.

Yes, Nessus UK offers an annual training budget of £5,000 per employee and supports key certifications like CISSP, OSCP, and SANS GIAC.

Clients consistently highlight Nessus UK’s responsiveness, technical expertise, and ability to translate technical risks into business insight.

Through initiatives like CyberSafe Schools, the UK Cyber Innovation Challenge, and charity partnerships with the National Cyber Security Centre.

Nessus UK’s core values are Integrity, Innovation, Collaboration, and Excellence – driving every client engagement and internal decision.

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