Managed Security Services London

A managed security service provider, or MSSP, is an external company that manages and monitors a business’s cyber security systems on its behalf.

Some providers focus mainly on monitoring. Others, like Sereno, can take broader responsibility for the protections around your devices, identities, Microsoft 365 environment and security controls.

Yes. Sereno Managed Security can work alongside your existing IT provider or internal IT team.

Your existing IT provider or internal team can continue managing wider IT support, infrastructure and day-to-day user requirements.

We document the agreed responsibilities and escalation routes, helping avoid gaps or duplicated work. This allows you to strengthen your security without replacing an IT arrangement that already works for your business.

We work alongside your existing IT manager or internal team, respecting their ownership of systems rather than trying to replace them.

Sereno can take responsibility for agreed specialist or ongoing security work, while your internal team stays focused on day-to-day operations, core systems, users, projects and the wider business.

This gives your IT team additional security capability while respecting their existing responsibilities and avoiding duplicated effort.

That depends on the package you choose.

Sereno Managed Security is designed to cover the core areas most businesses rely on every day, from devices and applications to Microsoft 365, user identities and business data.

This can include:

• Device and application security
• Microsoft 365 protection
• Identity and account security
• Vulnerability management
• Security monitoring
• Reporting and compliance visibility
• Investigation and response where included

If wider network security or specialist services sit with another provider, we make that clear from the start.

We help you decide based on your current setup, risk level and how much security responsibility you want Sereno to take on.

We look at what you already have before recommending anything.

This usually includes:

• Your current security tools
• Users, devices and applications
• Microsoft 365 configuration
• Internal IT capability
• Security and compliance requirements
• Cyber Essentials priorities
• Whether you need 24/7 monitoring and response

The right package is the one that gives you the protection you need without paying for controls you do not.

Yes. Standard is our recommended package for businesses working towards a stronger Cyber Essentials-ready security baseline.

It adds broader controls around devices, applications, Microsoft 365, vulnerabilities, recovery and reporting.

Cyber Essentials certification remains a separate assessment, but Standard helps put the underlying protections in place and keeps them managed afterwards.

24/7 Managed Threat Detection & Response is included within the relevant Premium packages.

This goes beyond basic alerting by adding continuous monitoring, investigation and response within the agreed scope.

This can include:

• Continuous monitoring
• Review of relevant security activity
• Investigation of suspicious behaviour
• Threat detection
• Escalation and response where included

The important difference is that an alert does not simply land with your team. Where the service covers it, there is someone responsible for investigating what happens next.