Zero Trust Security for UK Businesses

The old assumption — that anything inside the office network is safe — broke the moment your people started working from home, on phones, and across cloud apps. Zero trust fixes that by tying access to verified identity and device posture, not network location. Below is exactly how it works, what AMVIA runs for you, and what it costs.

How does zero trust security work?

Zero trust works by removing implicit trust from your network. Every user and device must prove who they are and that they meet your security standards on each access request — not once at the perimeter. It rests on four controls working together.

• Identity-led verification — every request is authenticated and authorised against identity and context, backed by multi-factor authentication, instead of trusting a device because it sits on the network.
• Least-privilege access — users and apps get only the access they genuinely need, so a stolen credential contains the blast radius rather than handing over the run of your systems.
• Microsegmentation — your environment is split into controlled zones so a compromise in one area can't move laterally into the rest unchecked.
• Continuous device posture — device health and risk are evaluated continuously; a device that drifts out of compliance loses access automatically until it's brought back to standard.

The NCSC sets out the same model in its zero trust architecture design principles (ncsc.gov.uk).

What's included in AMVIA's zero trust deployment?

AMVIA delivers zero trust end to end — from assessment to fully managed enforcement — alongside your managed security service. We don't hand you a licence and walk away; our UK team builds the policies and operates them day to day. The rollout runs in four stages.

• 01 Assess and map — we map your users, devices, applications and data flows, and pinpoint where implicit network trust currently exposes you.
• 02 Identity and MFA foundation — we establish single sign-on and multi-factor authentication as the foundation every access decision is made against.
• 03 Policies and segmentation — we define least-privilege access policies and segment access per application, replacing broad VPN-style network access with per-app controls.
• 04 Manage and monitor — our team operates the policies, tuning access and responding to risk signals through our 24/7 managed SOC as your business changes.

Device posture and conditional access are enforced through Microsoft Intune and Microsoft Defender, the tools we standardise on across our endpoint security stack.

Why do UK SMEs need zero trust?

UK SMEs need zero trust because the perimeter no longer holds and identity is now the primary attack surface. With hybrid working, cloud apps and stolen credentials, location-based security leaves the most common attack path — a compromised login — wide open. The data is blunt.

• 43% of UK businesses experienced a cyber breach or attack in the last 12 months (gov.uk Cyber Security Breaches Survey 2025).
• Phishing remains the single most common attack type, hitting 85% of businesses that identified a breach (gov.uk Cyber Security Breaches Survey 2025).
• Around 40% of UK businesses have MFA fully enabled (DSIT 2025) — leaving the majority exposed to credential theft.
• An estimated 19,000 UK businesses were hit by ransomware in the past year (Sophos 2025).

Zero trust targets that first link directly: even a valid stolen credential can't roam, because each request is re-verified against identity and device health.

Zero trust vs the traditional perimeter: what changes?

The shift is from "trusted once you're inside" to "verified on every request". A VPN grants a connected device broad internal access; if that device or its credentials are compromised, the attacker often inherits wide network reach. Zero trust makes per-application decisions on every request instead.

How much does zero trust cost?

Zero trust licences start from £4.60 per user per month — the same list price as Microsoft 365 Business Basic, which carries the identity and conditional-access features the model is built on (microsoft.com/en-gb). That figure is the licence only; AMVIA's configuration and ongoing management are delivered as part of our managed security service.

Licence only — requires AMVIA Managed Security to configure, monitor and tune the controls so zero trust actually works in practice rather than sitting unused.

Why choose AMVIA for zero trust?

AMVIA configures and runs zero trust for you with a UK security team — identity-led controls implemented to recognised standards, not a licence left for you to manage. We design the access policies, deploy MFA and segmentation, and operate the controls every day.

• Certified to UK standards — AMVIA holds Cyber Essentials Plus and Microsoft Solutions Partner status (Modern Work, Security and Azure Infrastructure), so identity and access controls are implemented to recognised UK security standards.
• 1,200+ UK businesses protected — we manage security for over 1,200 UK businesses across legal, finance, healthcare and professional services, rated 4.8/5; zero trust slots into a proven managed practice.
• Sheffield-based, UK-focused — our security engineers operate from Sheffield and understand UK compliance requirements and the realities facing British SMEs.