The Best Red Team Companies UK
The best UK red team companies in 2026 are CREST-accredited adversary-simulation providers with verifiable accreditations, in-house operators, and a proven purple-team feedback loop into detection. This guide compares 7 leading providers: Precursor Security, NCC Group, JUMPSEC, Pen Test Partners, LRQA Nettitude, MDSec, and Bridewell, on criteria any buyer can check independently.
Seven CREST-accredited UK red team companies compared on the criteria that actually matter to buyers: scope realism, verifiable accreditation, whether threat-led scheme approval is genuinely held, and whether findings feed back into detection.
We are Precursor Security, and we have ranked ourselves first on this list.
Rather than pretend otherwise, we publish the selection criteria in full, describe every competitor fairly, and link the independent CREST member directory so you can check our working. We are also explicit about the distinction that matters here: Precursor aligns its red team methodology to CBEST and TIBER-EU, but it is not itself a Bank of England scheme-approved provider of CBEST or STAR-FS, the regulator-run frameworks required by the very largest UK financial institutions. Where a competitor on this list genuinely holds that scheme approval, we say so.
Seven firms, side by side
| Provider | CREST status | Pricing published | From |
|---|---|---|---|
| 1. Precursor Security | Pen Test + VA + SOC | Yes | From £15,000 |
| 2. NCC Group | Member firm | No | On application |
| 3. JUMPSEC | Member firm + NCSC CHECK | No | On application |
| 4. Pen Test Partners | Member firm | No | On application |
| 5. LRQA Nettitude | Member firm + CREST STAR | No | On application |
| 6. MDSec | Member firm | No | On application |
| 7. Bridewell | Member firm | No | On application |
Verified against each company's public website, August 2026. "Pricing published" means a rate or starting price appears on the firm's own site; red team scopes vary widely and most firms quote after a discovery call.
The 7 best UK red team
companies in 2026
1. Precursor Security
Precursor holds triple CREST accreditation across Penetration Testing, Vulnerability Assessment, and Security Operations Centre services, a combination held by fewer than 70 firms worldwide. Red team engagements are objective-based and assumed-breach: threat modelling, reconnaissance, multi-vector execution, and a purple team debrief mapped to MITRE ATT&CK, published from £15,000. Every operator is a UK-based, DBS-checked employee with no subcontracting. For financial-services firms, engagements can follow CBEST and TIBER-EU methodology. The structural difference is the closed loop: Precursor also runs 24/7 SOC monitoring, so red team findings feed directly into detection rules, and the same firm that ran the attack can prove the fix.
Trade-off: Precursor aligns its red team methodology to CBEST and TIBER-EU, but it is not a Bank of England scheme-approved CBEST or STAR-FS provider. Those schemes are mandated for the very largest, systemically important financial institutions and require scheme-specific provider approval that only a small number of firms hold. If your regulator has named one of these frameworks in writing, shortlist a scheme-approved provider. For standard objective-based adversary simulation and purple teaming, and for CBEST or TIBER-EU methodology alignment, Precursor covers the requirement.
2. NCC Group
NCC Group is one of the largest security consultancies in the world, headquartered in Manchester, and is publicly known as one of the small number of firms approved to deliver Bank of England CBEST and STAR-FS threat-led testing for the UK's largest financial institutions. That scheme approval, alongside the bench depth to staff long, intelligence-led engagements, is what sets NCC apart for globally systemic firms.
Trade-off: Engagement model and pricing are built for enterprise and regulated-sector procurement, and costs are on application. Smaller organisations without a scheme mandate are unlikely to be a priority client.
3. JUMPSEC
JUMPSEC holds NCSC CHECK status alongside CREST membership, which makes them a strong choice for PSN-connected environments and government work that mandates CHECK delivery. They run adversary simulation and red team exercises for both public sector and private clients, with published case studies as proof.
Trade-off: Pricing on application, and CHECK-scheme delivery is oriented around public sector procurement processes rather than fast commercial turnaround.
4. Pen Test Partners
Pen Test Partners are the UK's best-known specialists in embedded and operational technology: connected vehicles, ships, planes, industrial control systems, and consumer IoT. Where a red team objective needs to reach a hardware or OT target rather than a standard corporate network, their research pedigree is hard to match.
Trade-off: A specialist strength rather than a broad red team practice; standard enterprise IT-focused adversary simulation is not their headline offering. Pricing on application.
5. LRQA Nettitude
Nettitude, now part of LRQA, is one of the UK's longest-established red team and threat intelligence providers, publicly recognised for CREST STAR (Simulated Targeted Attack and Response) accreditation, the intelligence-led testing scheme that underpins frameworks such as CBEST. Their heritage in threat-intelligence-led engagements predates most of this list.
Trade-off: Delivery sits inside a large, multi-service group (LRQA) rather than a red-team-only specialist, and pricing is on application.
6. MDSec
MDSec is a Manchester-based offensive security specialist built by well-known red team practitioners, and is publicly known for developing its own command-and-control tooling used in advanced adversary simulation engagements. For a red team exercise that needs to evade a mature EDR and SOC stack using genuinely custom tradecraft, their research output speaks for itself.
Trade-off: A tooling and tradecraft specialist rather than a broad-service consultancy; standard penetration testing and compliance-driven scopes are not the focus. Pricing on application.
7. Bridewell
Bridewell works extensively with critical national infrastructure sectors, including energy, aviation, transport, and government, and pairs red team and adversary simulation work with a wider managed security and consulting practice for organisations in regulated, high-criticality environments.
Trade-off: A broad, multi-service consultancy rather than a red-team-only specialist, and pricing is on application.
How we ranked them
Six criteria specific to red team and adversary simulation buying, each something a buyer can verify without taking anyone's word for it. Weighting is ours; the underlying facts are checkable.
Whether engagements are assumed-breach and objective-based, chasing a defined Crown Jewel, rather than a relabelled external penetration test with a longer timeline.
Whether the firm genuinely holds accreditation for regulator-run schemes such as CBEST, STAR-FS, or TIBER-EU if you are a large regulated institution, or delivers standard CREST-accredited adversary simulation if you are not. The right answer depends on your regulatory tier, not a firm's marketing.
Whether the provider also runs, or has genuine visibility into, the SOC being tested, so red team findings translate into tuned detections rather than a report that sits in a drawer.
Company accreditation in the CREST directory, and individual tester certification, not just an organisational badge on a website footer.
A documented Rules of Engagement process, abort codes, and a track record of running realistic attacks without causing business disruption.
Whether the report gives your board an attack narrative and your SOC a MITRE ATT&CK coverage heatmap showing tested versus detected techniques, not raw exploit output.
Red flags when choosing
a red team company
Whichever firm you choose, including us, walk away if you see these.
A pentest with a red team label
Ask exactly what makes the engagement a red team exercise rather than relabelled infrastructure testing: a defined objective, an assumed-breach or full-chain scenario, and concealment from the SOC. If the answer is a longer scope and a bigger invoice, it is not a red team.
No assumed-breach or objective-based scenario
A red team exercise should chase a specific goal, such as reaching a Crown Jewel system or exfiltrating defined data, using assumed-breach or full kill-chain tradecraft, not a broad vulnerability sweep. If the proposal reads like a vulnerability inventory with a longer timeline, push back.
Confusing standard red teaming with CBEST or STAR-FS
CBEST, STAR-FS, and TIBER-EU are scheme-mandated engagements for the largest financial institutions, requiring specific provider accreditation. If a firm offers to "align" with these frameworks without holding the scheme accreditation itself, ask exactly what that means and whether it satisfies your regulator in writing.
No purple-team feedback loop into detection
A red team report that lists what was exploited without a structured debrief mapping detection failures to MITRE ATT&CK leaves your SOC no better off than before the engagement. Ask what the post-engagement debrief actually covers.
POA-only pricing with no rate guidance
UK red team engagements typically run £15,000 to £50,000 or more depending on scope and duration. A firm that will not anchor a rough range before a discovery call is optimising for deal-size discovery, not your budget.
Reports with no MITRE ATT&CK detection-gap mapping
Ask for a redacted sample report before you buy. If it does not map tested techniques to MITRE ATT&CK and show which ones your SOC detected versus missed, your defenders get a story, not a remediation plan.
UK red team prices in 2026
Across the market, standard objective-based red team exercises for a mid-sized organisation run £15,000 to £25,000 for a 2 to 4 week engagement. Extended engagements with advanced adversary emulation run £35,000 to £50,000 or more. Regulator-run scheme engagements such as CBEST, STAR-FS, or TIBER-EU, delivered only by scheme-approved providers, typically cost £40,000 to £60,000 or more over 6 to 12 months.
Full red team service and pricing detailRelated reading
Red Team Operations
Precursor's CREST-accredited red team service, from £15,000
Penetration Testing
CREST-accredited pentesting for organisations not yet ready for a full red team
The Closed-Loop Model
How offensive findings feed our own SOC's detection coverage
Best Penetration Testing Companies UK
The same comparison methodology, applied to standard pentesting
Best Pentesting for Financial Services
A sector-specific comparison for regulated financial firms
Compare us against anyone on this list.
A published starting price. Findings that feed our own SOC's detection rules. A purple team debrief in every engagement.
Choosing a red team company
The questions buyers ask most when comparing UK red team providers.
UK red team engagements typically cost from £15,000 for a standard 2 to 4 week objective-based exercise on a mid-sized organisation, rising to £35,000 to £50,000 or more for extended 4 to 6 week engagements with advanced adversary emulation. Engagements aligned with regulator-run threat-led schemes such as CBEST, STAR-FS, or TIBER-EU, which require scheme-specific provider accreditation, typically cost £40,000 to £60,000 or more and run over 6 to 12 months including a dedicated threat intelligence phase. Most firms on this list price on application; get a fixed quote after a scoping call.
A penetration test finds as many vulnerabilities as possible within a defined scope over 5 to 10 days, validating technical controls and patch status, and is reported openly to the security team throughout. A red team engagement has a specific objective, such as reaching a payment system or exfiltrating a customer database, runs over 4 to 12 weeks, stays concealed from the SOC to test realistic detection, and validates people, process, and technology together rather than just technical controls.
CBEST, STAR-FS, and TIBER-EU are regulator-driven, intelligence-led testing schemes mandated for the UK and EU's largest, systemically important financial institutions, and only a small number of scheme-approved firms can deliver them. Most organisations, including the large majority of mid-market and enterprise firms outside that systemic tier, need standard objective-based adversary simulation rather than a scheme-mandated engagement. If your regulator has named CBEST, STAR-FS, or TIBER-EU in writing, confirm your chosen provider holds the specific scheme accreditation before scoping; if not, a standard CREST-accredited red team exercise with a purple team debrief covers the requirement.
Purple teaming is the collaborative practice of combining the red team (attackers) and blue team (defenders) in a structured debrief after a red team exercise. The two sides replay each stage of the attack together, identify which MITRE ATT&CK techniques went undetected, review why specific EDR and SIEM alerts failed to fire, and produce detection improvement recommendations. Purple teaming turns a red team engagement into a measurable improvement in detection coverage rather than a one-off report.
The leading UK red team and adversary simulation providers include Precursor Security, NCC Group, JUMPSEC, Pen Test Partners, LRQA Nettitude, MDSec, and Bridewell. Each has a different area of strength: NCC Group and LRQA Nettitude for regulator-scheme-aligned financial services work, JUMPSEC for NCSC CHECK and public sector engagements, Pen Test Partners for IoT and OT targets, MDSec for advanced custom tradecraft, Bridewell for critical national infrastructure, and Precursor Security for mid-market adversary simulation with findings that feed directly into an in-house SOC.