What does a managed security service provider do?

A managed security service provider (MSSP) handles the day‑to‑day operation of your cyber security. That can include monitoring logs and alerts, managing tools such as SIEM and EDR, investigating suspicious activity and coordinating incident response. The goal is to reduce your risk and free your internal team to focus on strategic work.

What is the difference between managed security services and MDR?

Traditional managed security services (MSS) focus on managing and monitoring security tools such as firewalls, SIEM and intrusion detection systems, often passing alerts back to your team to action. Managed Detection and Response (MDR) goes further by actively hunting for threats and taking containment action on your behalf. Many modern managed cyber security services bundle both, so you benefit from tool management and hands‑on response.

How much do managed cyber security services cost?

The cost of managed cyber security services depends on factors such as the number of users and endpoints, the size and complexity of your environment, the services included and the SLAs you require. For many UK mid‑market organisations, a fully managed service including MDR, SIEM and vulnerability management typically starts from a low five‑figure annual subscription. We’ll scope your needs and provide a clear, tailored quote after a short discovery call.

What are the benefits of managed cyber security services?

Managed cyber security services provide benefits such as:Reduced risk of cyber attacks through always‑on monitoring and rapid responseAccess to specialist security expertise that would be hard to hire in‑houseUse of enterprise‑grade security tools without large upfront capital investmentScalable protection that grows with your organisation and changing threat landscapeLess operational pressure on your internal IT team, freeing them to focus on strategic projects

What should I look for in a managed security service provider?

Look for a provider with strong certifications, relevant experience and genuine 24/7 coverage. Check for accreditations such as CREST, ISO 27001 and Cyber Essentials Plus, sector‑specific case studies and named analysts you can speak to. Make sure they can cover your full estate – endpoints, networks, identity and cloud – and ask how they handle incidents, not just how they raise alerts.

How do managed cyber security services help with compliance?

A good managed cyber security service produces the evidence auditors and regulators expect as part of day‑to‑day operations. That includes logs, alert and response timelines and clear records of the controls in place. We help clients with evidence frameworks such as Cyber Essentials, Cyber Essentials Plus, ISO 27001, NIS2, GDPR, FCA rules and sector‑specific requirements, often reducing audit preparation from weeks to days.

Services/Cyber Security & Compliance solutions /Managed Cyber Security Services

Managed Cyber Security Services

We watch for threats, so you don’t have to

Ransomware, phishing and supply-chain attacks are constant threats, but most organisations do not have the time, tools or in-house team to monitor everything around the clock.

Nasstar’s managed cyber security services help you monitor, detect and respond to threats through a managed service built around your business, infrastructure and risk profile.

As your managed security service provider, we help reduce pressure on your internal IT team while giving you clearer visibility of your security posture.

What are Managed Cyber Security Services?

Managed cyber security services are an outsourced model where a specialist provider, also known as a managed security service provider or MSSP, monitors, detects and responds to cyber threats on your behalf. Instead of building and staffing an in-house security operations team, your organisation gets access to security expertise, mature tools and always-on monitoring through a managed service.

At Nasstar, our managed cyber security services can bring together threat monitoring, vulnerability management, endpoint protection, email security and incident response into a more joined-up security model, tailored to your risks, infrastructure and compliance needs.

24/7 protection from our UK Security Operations Centre

Cyber attacks don’t respect office hours, so your defences can’t either. Our UK‑based security team monitors your environment 24/7, reviewing alerts and investigating suspicious activity so you don’t have to watch dashboards around the clock.

Our analysts review alerts, investigate suspicious activity and escalate confirmed incidents through agreed playbooks, so your internal team only gets pulled in when action is needed.

Our Managed Cyber Security Services

Each of the services below can be delivered on its own or as part of a wrap‑around managed cyber security service.

24/7 security monitoring from our UK‑based security team
Managed Detection and Response (MDR) across endpoints, networks, identities and cloud
Managed SIEM to deploy, tune and operate your security monitoring platform
Ongoing vulnerability management with regular scanning and prioritised remediation guidance
Endpoint protection and response to keep user devices and servers secure
Email and phishing protection to block malicious content and social‑engineering attacks
Threat monitoring and intelligence to keep defences aligned to emerging attacker techniques
Incident response support to help contain, investigate and recover from security incidents
Security reporting and help evidencing key controls for frameworks such as Cyber Essentials and ISO‑style standards
Optional user awareness and phishing training to strengthen your people as a line of defence

Why choose Nasstar as your Managed Security Service Provider?

Our managed cyber security services are a strong fit for UK mid‑market organisations and larger enterprises that need 24/7 protection, especially in regulated sectors and cloud‑first environments.

Our analysts hold industry‑recognised certifications including CREST, CISSP and CEH, and our SOC is certified to standards such as ISO 27001 and Cyber Essentials Plus. We’ve been delivering managed security services in the UK for over a decade, combining deep technical capability with sector‑specific experience.

We start by understanding how your organisation operates, where your critical assets sit and which risks matter most. Your controls are then designed around your business priorities, rather than lifted from a generic template.

As your organisation grows, your cyber security service needs to keep pace. Whether you are adding users, endpoints, cloud environments or locations, we help adapt your managed service around your changing risk profile.

Whether you need to evidence Cyber Essentials, ISO 27001, NIS2, FCA controls or sector‑specific regulations, our reporting is designed to make audits faster, not harder. We provide the logs, timelines and control attestations auditors expect, helping you reduce the time and effort spent preparing for assessments.

How we work with you

Onboarding a managed cyber security service shouldn’t feel like a leap into the unknown. Our five‑step engagement model is designed to get you protected quickly, with clear expectations at every stage.

Assess: We review your current security posture, risks, tooling and existing controls, and identify the gaps that matter most.
Design: We agree a tailored service design covering scope, SLAs, escalation paths and integrations before anything goes live.
Deploy: We onboard your estate, tune detections to your environment and run a controlled cutover to live monitoring.
Manage: We deliver 24/7 monitoring, detection, response and reporting from our UK SOC, in line with the agreed model.
Review: We run regular service reviews and threat‑landscape briefings and maintain a continuous improvement roadmap.

Whatourexpertsays...

Cyber security services are a key element for every business, no matter what shape or size you are. At Nasstar, our breadth of experience in Cyber Security as a Service makes us the ideal partner to take you on a journey to improve your defences and ensure your organisation is equipped to deal with any security challenges you may face.

Justin BarkerEmployee Experience Practice Lead, Nasstar

Managed Cyber Security Services Case studies

We’ve worked with a number of businesses on managing their cyber security solutions and protecting their assets from ever-changing cyber risks.

Banking & FS

AGS Accounting

FAQs

Managed cyber security services work by connecting your systems, applications and networks to a specialist provider’s monitoring and response capability. The provider ingests logs and telemetry from tools such as firewalls, SIEM and endpoint protection, then uses that data to detect suspicious activity, investigate potential threats and respond according to agreed playbooks.

In practice, that means your environment is monitored 24/7, with alerts reviewed by security specialists instead of landing directly on your internal team. You stay in control of strategy and risk decisions, while the day‑to‑day work of watching dashboards, tuning detections and handling incidents is carried out on your behalf.

Talk to a Cyber Security Expert

Unsure which managed cyber security services are right for you? Talk to one of our experts. We’ll take the time to understand your risks, existing tooling and compliance obligations, then recommend a service design that fits – with no obligation and no hard sell.