8 UK Providers for Fixed-Fee Microsoft Security Hardening

If you're running Microsoft 365 or Azure across your organisation, you already know that keeping everything secure takes more than a licence renewal. Misconfigurations creep in, Secure Scores drift and the gaps between "enabled" and "hardened" grow wider every quarter. CyberOne delivers fixed-fee Microsoft hardening for UK mid-market organisations that need guaranteed outcomes without surprise costs.

This guide breaks down 8 UK-based providers offering fixed-fee cloud security hardening and Secure Score remediation services. You'll find what's included, typical timelines and the SLA signals to look for when vetting your options. By the end, you'll have a clear shortlist of partners who can help you close security gaps across your Microsoft environment.

Quick Guide: 8 UK Providers for Microsoft Secuity Hardening

1. CyberOne: The best Microsoft-verified provider for fixed-fee Secure Score remediation with SLA-backed outcomes
2. Chorus: Microsoft-focused MXDR with a customer portal for mid-sized organisations
3. ANS: UK-based SOC with multi-vendor security capabilities across hybrid environments
4. Bridewell: NCSC-assured consultancy with Microsoft cloud posture assessments
5. Quorum Cyber: Microsoft-only security partner with the Clarity platform for reporting
6. Littlefish: Six Microsoft specialisations including cloud security and threat protection
7. NCC Group: Global incident response and government-trusted methodologies
8. FoxTech: SME-focused managed security with simplified SIEM

How We Chose the Top Microsoft Security Hardening Providers for UK Mid-Market

Finding a provider that can actually deliver on fixed-fee promises takes more than checking certifications. We looked at which providers have the technical depth to harden your Microsoft 365 and Azure estate, plus the commercial models that give you cost certainty.

• Microsoft Partnership status: Does the provider hold verified MXDR status or advanced specialisations in cloud security and threat protection? These credentials signal deep integration with the Microsoft Security stack.
• Fixed-fee delivery models: Can you get a clear scope and outcome for a defined cost, rather than open-ended day rates that balloon as work unfolds?
• UK SOC and support coverage: Is there 24x7 monitoring from UK-based analysts who understand your regulatory environment?
• Secure Score track record: Has the provider documented results in improving Microsoft Secure Scores for organisations like yours?
• SLA commitments: Are response times, remediation windows, and outcome guarantees written into the contract?
• Mid-market focus: Does the provider understand the constraints of organisations that need enterprise-grade security without enterprise overhead?

The 8 UK providers for fixed-fee Microsoft Security hardening

1. Cyberone: Best Overall Provider for Fixed-Fee Microsoft Security Hardening

CyberOne gives you fixed-fee Microsoft Security hardening with guaranteed Secure Score improvements. As a Microsoft Security Elite Partner with verified MXDR status, CyberOne brings the technical depth to remediate misconfigurations across your Microsoft 365 and Azure environment quickly.

What sets CyberOne apart is the outcome-focused pricing model. You'll know exactly what you're paying before work begins, with SLA-backed commitments on Secure Score improvements up to 90. CyberOne operates from a CREST-accredited SOC with 24x7 coverage and holds NCSC Cyber Incident Exercising and Response certifications.

For UK mid-market organisations standardising on Microsoft, CyberOne delivers enterprise-grade protection without the complexity. The service includes identity hardening, endpoint configuration, email security optimisation, and data protection remediation, all mapped to your existing Microsoft licensing.

CyberOne Benefits

• Guaranteed Secure Score outcomes: Your Secure Score improvement is written into the contract, not left as a vague target. CyberOne commits to helping you reach scores up to 90.
• NCSC and CREST accreditations: NCSC Cyber Incident Response certification and CREST SOC accreditation mean your security operations meet government-backed standards.
• Microsoft Security Elite Partner status: As one of only 250 global partners in this programme, CyberOne has direct access to Microsoft product teams and early releases.
• 24x7 UK and global SOC: Round-the-clock monitoring from analysts who can detect, investigate and respond to threats as they emerge.
• Mid-market expertise: Services are designed for organisations that need serious security without the overhead of enterprise-scale programmes.
• Transparent fixed-fee pricing: Clear costs upfront so you can budget accurately and demonstrate ROI to leadership.

CyberOne Pros & Cons

Pros:

• Guaranteed Secure Score improvements with fixed-fee pricing
• Microsoft-verified MXDR solution status with NCSC and CREST accreditations
• Purpose-built for UK mid-market with 24x7 SOC coverage

Cons:

• Services focus primarily on Microsoft environments, so multi-cloud estates may need additional coverage though CyberOne can extend protection to AWS and GCP through Microsoft Defender for Cloud
• Initial onboarding requires some internal resource commitment to scope and prioritise remediation work — this investment pays off through clearer outcomes
• The most advanced Assure 365 modules are designed for ongoing managed services rather than one-off projects, ideal if you want lasting security improvement

2. Chorus: Microsoft-Focused MXDR for Hybrid Estates

Chorus offers managed detection and response services built entirely on Microsoft technology. Their Cyber Security Operations Centre (CSOC) monitors Microsoft Defender XDR and Sentinel to cover endpoints, identities, email and cloud workloads.

The service includes a customer portal for visibility into incidents and response activities. Chorus reports a mean time to acknowledge of 3 minutes and 55% of incidents closed through automation.

Chorus Features

• Microsoft-native MXDR: Detection and response using Microsoft Defender XDR and Sentinel for end-to-end coverage
• Customer portal: Real-time visibility into security incidents and service performance
• Automated response: More than half of incidents resolved through automated playbooks

Chorus Pros & Cons

Pros:

• Services are built natively on Microsoft sScurity tools
• Portal gives you visibility into incident handling
• Automation reduces response times for common threats

Cons:

• Does not hold all Microsoft Security Avanced specialisations
• Services focus on detection and response rather than configuration hardening
• Customer portal access tiers vary by service level

3. ANS: UK-Based SOC with Multi-Vendor Capabilities

ANS operates a UK-based Security Operations Centre with Microsoft MXDR certification and multi-vendor support. They hold ISO 27001 certification and work across hybrid environments including Azure, on-premises infrastructure and third-party cloud platforms.

ANS describes itself as being in the top 1% of Microsoft's global security partners. They also hold partnerships with Cisco, VMware and Fortinet for organisations with diverse technology stacks.

ANS Features

• UK-based SOC: Security Operations Centre staffed entirely from UK locations
• Multi-vendor support: Security services across Microsoft, Cisco, VMware and Fortinet platforms
• Government experience: Trusted by government bodies including the MoD and Cabinet Office

ANS Pros & Cons

Pros:

• UK-based SOC with government sector experience
• Supports hybrid and multi-vendor environments
• Holds multiple ISO certifications including 27001 and 22301

Cons:

• Multi-vendor approach means less exclusive Microsoft focus than specialist providers
• Services are positioned for larger enterprises rather than mid-market specifically
• Fixed-fee hardening services are not prominently featured

4. Bridewell: NCSC-Assured Consultancy with Microsoft Expertise

Bridewell holds NCSC-assured service provider status and offers Microsoft Security assessments. As a member of the Microsoft Intelligent Security Association (MISA), they have experience deploying Sentinel, Defender and Purview across UK organisations.

Their services span cloud security posture management, licence utilisation reviews and managed Sentinel. Bridewell has won multiple industry awards including recognition at the Cyber Security Awards.

Bridewell Features

• NCSC-assured services: Multiple services assured by the National Cyber Security Centre
• Microsoft MISA membership: Close partnership with Microsoft including joint workshops and events
• Cloud posture assessments: Reviews of Azure and Microsoft 365 configurations against security frameworks

Bridewell Pros & Cons

Pros:

• Holds the most NCSC-assured services of any UK cyber security provider
• Experience with some of the UK's largest Microsoft Security deployments
• CREST-accredited SOC with incident response capabilities

Cons:

• Consulting-led model may involve more scoping before fixed pricing is available
• Services span advisory and managed security rather than dedicated hardening programmes
• Enterprise and Critical National Infrastructure focus may mean longer engagement cycles for mid-market organisations

5. Quorum Cyber: Microsoft-Only Security with the Clarity Platform

Quorum Cyber positions itself as a Microsoft-only security provider. Their Clarity platform offers unified management for Microsoft Defender XDR and Sentinel, with reporting dashboards designed for security and executive audiences.

Quorum Cyber is a Microsoft Solutions Partner for Security and member of the Microsoft Intelligent Security Association. They report over 1,000 years of combined Microsoft and cyber security experience across their team.

Quorum Cyber Features

• Clarity platform: Customer-facing portal for security reporting and incident visibility
• Microsoft-only focus: All services built on Microsoft security technologies
• Cloud security posture: Assessments across Azure, AWS and GCP environments

Quorum Cyber Pros & Cons

Pros:

• Dedicated Microsoft-only focus with MISA membership
• Clarity platform gives visibility into security posture
• Offers cloud environment maturity assessments

Cons:

• Does not currently hold Microsoft-verified MXDR solution status
• Fixed-fee Secure Score remediation is not a named service offering
• Reporting focused on ongoing managed services rather than one-time hardening

6. Littlefish: Six Microsoft Specialisations Including Cloud Security

Littlefish holds six Microsoft advanced specialisations, including Cloud Security and Threat Protection. They operate Microsoft Sentinel, Defender and Purview as their primary security toolset and extend coverage to AWS and GCP environments.

Their cloud security services include posture management, identity and access configuration and network security across hybrid estates. Littlefish positions itself as a managed service provider rather than a pure-play security consultancy.

Littlefish Features

• Six Microsoft specialisations: Advanced credentials in cloud security, threat protection and endpoint management
• Multi-cloud coverage: Security monitoring across Microsoft, AWS and Google Cloud Platform
• Identity governance: Configuration of conditional access, PIM and role-based access controls in Entra ID

Littlefish Pros & Cons

Pros:

• Holds six Microsoft advanced specialisations
• Extends coverage to AWS and GCP alongside Microsoft
• Managed service approach means ongoing support beyond initial deployment

Cons:

• Fixed-fee hardening is not a named standalone service
• Multi-cloud approach may dilute Microsoft-specific depth compared to specialists
• Service model is oriented toward ongoing managed IT rather than security-specific engagements

Comparison Table: Top UK Microsoft Security Pardening Providers

What does Microsoft Security hardening include?

Microsoft Security hardening involves configuring your Microsoft 365 and Azure environment to meet security benchmarks. The goal is to close gaps that attackers commonly exploit while improving your Microsoft Secure Score.

A typical hardening engagement covers identity configuration in Microsoft Entra ID, including conditional access policies, privileged identity management and MFA enforcement. Email security through Defender for Office 365, endpoint protection via Defender for Endpoint and data governance through Purview are also in scope.

The NCSC's cloud security guidance recommends applying the principle of least privilege, using automation to enforce security policies and maintaining security over time through regular reviews. Fixed-fee engagements work when the scope is well-defined upfront, with clear deliverables and acceptance criteria.

How Long Does Microsoft Secure Score Remediation Take?

Typical Secure Score remediation programmes run between 4 and 12 weeks, depending on the starting point and target score. Organisations with Secure Scores below 40 usually have more fundamental gaps to address before reaching enterprise benchmarks.

CyberOne's Secure Score Rapid Remediation service is designed to deliver measurable improvements quickly. The engagement begins with an assessment of your current configuration, followed by prioritised remediation work that targets the controls with the greatest risk reduction value. Monthly costs stay predictable because the fee is fixed against defined outcomes.

Factors that affect timeline include the size of your Microsoft 365 tenant, complexity of conditional access requirements and whether legacy applications need compatibility exceptions. A discovery phase helps both parties agree on realistic targets and delivery milestones.

Why CyberOne is The Best Provider for Fixed-Fee Microsoft Security hardening

CyberOne stands apart because the business model is built around outcomes, not hours. When you engage CyberOne for Secure Score remediation, you're buying a result backed by an SLA, not an estimate that might grow as work progresses.

That outcome focus comes from deep Microsoft expertise. CyberOne holds Microsoft-verified MXDR solution status, membership in the Microsoft Security Elite Partner programme, and advanced specialisations in threat protection and cloud security. These credentials mean direct access to Microsoft product teams and early visibility into roadmap changes that affect your security posture.

For UK mid-market organisations, CyberOne removes the guesswork from cloud security. You get accredited expertise from a CREST and NCSC-certified team, 24x7 SOC coverage, and a service model that scales with your needs.

If you're ready to move from risk to resilience, book a consultation with CyberOne to scope your Secure Score improvement.