Precursor Security
CREST-Accredited · UK-Based · Full-Spectrum

UK Cyber Security
Consultancy

CREST-accredited penetration testing, 24/7 managed SOC, and compliance certification. Delivered by UK-based consultants from our Leeds headquarters.

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CREST Penetration Testing
CREST Vulnerability Assessment
CREST SOC
Cyber Essentials Plus
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Precursor Security is a UK cyber security consultancy and CREST-accredited penetration testing company. Mid-market and enterprise organisations manage their full security programme under one contract, across three integrated pillars.

Offensive Security
Penetration testing, red team, social engineering
Defensive Security
24/7 managed SOC, MDR, incident response
Compliance & Governance
ISO 27001, Cyber Essentials, GDPR, PCI DSS
Pen testing from £2,500
Managed SOC from £900/mo
Cyber Essentials from £300

Not sure where to start?

A free consultation takes 30 minutes. We review your situation and recommend the right starting point, without pressure to commit.

Book Free Consultation

Our Service Pillars

Three integrated pillars. One contract. Offensive testing, defensive monitoring, and compliance governance delivered by a single CREST-accredited team.

CREST-Accredited

Offensive Security

CREST-Accredited Penetration Testing

Manual, intelligence-led adversarial simulation. We find the vulnerabilities scanners miss before attackers exploit them.

External Network Penetration TestInternal Network Penetration TestWeb Application Penetration TestRed Team OperationsSocial EngineeringCloud Penetration Testing
From £2,500Explore
24/7 UK SOC

Defensive Security

24/7 Managed SOC & MDR

Around-the-clock monitoring from our UK-based SOC. We detect, investigate, and contain threats before they become breaches.

Managed SOCManaged Detection & ResponseIncident ResponseThreat HuntingEdgeProtect (Attack Surface Management)
From £900/moExplore
ISO 27001 · Cyber Essentials

Compliance & Governance

Certification & Gap Analysis

Board-ready assessments and certification support. We map your posture against recognised frameworks and deliver a prioritised remediation roadmap.

Cyber Essentials CertificationISO 27001 ConsultancyGDPR & Data ProtectionPCI DSS AssessmentCSRB 2025 Readiness
From £1,250Explore
Security Primer

What you need to know.

Clear definitions for the core components of a modern, resilient cyber security posture.

What is Offensive Security?

Authorised, intelligence-led attacks against your systems designed to find and exploit vulnerabilities before real adversaries do. It validates whether your defences actually hold under fire.

What is Defensive Security?

Continuous 24/7 monitoring, threat hunting, and rapid incident response. When an attacker attempts to breach your perimeter, they are detected and contained in minutes, not months.

What is Threat Intelligence?

The collection, processing, and analysis of adversary data to understand motives, targets, and attack methods. Turns raw threat feeds into actionable context that drives SOC triage, penetration test scoping, and boardroom risk decisions.

What is a Security Assessment?

A high-level evaluation of your technical controls, policies, and human processes. It provides a baseline of your current posture and delivers a prioritised roadmap to close critical gaps.

Trusted across: Financial Services · Healthcare · Legal · Government · Technology

UK-headquartered in Leeds · Newcastle SOC · London · Edinburgh · CREST member

Independently Verified

Trust is audited.

Every claim backed by independent accreditation. Verify directly with the issuing bodies.

CRESTCREST Pen TestingCRESTCREST SOCCCSCrown CommercialCE+Cyber Essentials+
Founded 2018HQ Leeds, UK24/7 SOC NewcastleAll staff UK-based, DBS-checked

Three steps. No surprises.

From first conversation to final report, the process is transparent and the pricing is fixed.

01

Free Scoping Call

A 30-minute call to understand your environment, compliance requirements, and risk profile. No commitment, no sales pressure.

02

Fixed-Price Proposal

You receive a detailed scope of work with fixed pricing. The number on the proposal is the number on the invoice.

03

Delivery & Reporting

Testing begins on your agreed date. Track progress in real time through our portal and receive a board-ready report on completion.

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Get Started

Ready to secure your organisation?

Speak to our team today to discuss your specific security requirements.

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CREST Triple Accredited|Fixed Price Quotes|Free Scoping Call|UK Based Team

Common Questions

Common questions about this service, methodologies, and deliverables.

A cyber security consultancy advises and supports organisations on identifying, managing, and reducing their cyber security risks. Unlike a software vendor or managed service provider, a consultancy provides independent expert assessment: telling you what your risks actually are, not selling you a product to fix them. At Precursor Security, this means delivering penetration testing that finds real vulnerabilities, a 24/7 managed SOC that monitors your network, and compliance consultancy that prepares you for ISO 27001, Cyber Essentials, or regulatory audits.
If you want to find vulnerabilities in your systems, you need offensive security (penetration testing). If you want continuous 24/7 protection and rapid response, you need defensive security (managed SOC or MDR). If you need to meet a regulatory or contractual standard, you need compliance services. Many organisations need elements of all three. If you are unsure, a free consultation call takes 30 minutes. We will review your situation and recommend the right starting point without pressure to commit.
A penetration test is a targeted, technical engagement: our testers attempt to actively exploit vulnerabilities in a defined scope (an external network, a web application, an internal environment) to demonstrate the real-world impact of those weaknesses. A cyber security assessment is a broader review of your organisation's security posture, examining your controls, policies, and processes against a framework such as ISO 27001 or Cyber Essentials. Both produce reports; the penetration test produces risk-rated technical findings and proof-of-concept evidence, while the assessment produces a gap analysis and remediation roadmap. Many organisations do both: an assessment first to establish the baseline, then testing to validate specific controls.
Penetration testing in the UK typically starts from £2,500 for a scoped web application or external network test. Internal network assessments, red team operations, and multi-environment engagements are priced based on scope: the number of targets, the testing days required, and the complexity of the environment. We provide fixed-price quotes based on a scoping call, with no hidden costs. Most tests are completed within 5 to 10 working days from the start of engagement.
Yes. Precursor Security holds CREST accreditation for penetration testing, vulnerability assessment, and Security Operations Centre services. CREST is the internationally recognised certification body for technical cyber security services in the UK. Our accreditation covers infrastructure, web application, and mobile penetration testing. CREST accreditation is a requirement of many UK public sector procurement frameworks and a minimum qualification for government ITHC and CHECK scheme testing.
A Penetration Test finds as many vulnerabilities as possible in a specific target (such as a web application or external network perimeter) within a defined timeframe and scope. A Red Team engagement simulates a real-world, stealthy attack campaign. The objective is to test your defensive team's ability to detect, respond to, and contain a realistic threat actor. Red Team operations are broader in scope, longer in duration, and measure your defensive capability as much as your technical vulnerabilities.
We can typically schedule scoping calls within 24 hours. Project start dates depend on availability but we often accommodate urgent requests for incident response or time-sensitive testing engagements. Contact us to check current availability.