SD-WAN for UK Businesses: Smarter Multi-Site Network Management

The Challenge of Multi-Site Connectivity

Businesses with multiple offices face a connectivity challenge that single-site businesses do not. Each site needs reliable internet access, but sites also need to communicate with each other and with central resources. Traditional approaches — MPLS private WAN or hub-and-spoke VPN — can be expensive, rigid, and slow to adapt when business requirements change.

Area 3: 46% of UK postcode sectors — limited competition; Openreach must provide dark fibre at cost-based prices (ISPreview)

Openreach FTTP footprint (Q3 2025): 19.7 million premises, covering 58.7% of all UK premises. (ISPreview)

Total FTTP coverage (Q3 2025): 79.5% of UK premises (~26.7 million premises) — across all operators including Openreach, altnets, VMO2, and KCOM. (ISPreview)

Cloud adoption has added a further complication. Traditional WAN architectures were designed to route traffic back to a central datacentre before going out to the internet. When your applications live in Microsoft 365, Azure, or other cloud platforms, that routing approach creates unnecessary latency. SD-WAN can provide direct internet breakout at each site whilst maintaining security and central management.

How SD-WAN Works

SD-WAN places an intelligent appliance at each site — typically a router or CPE (customer premises equipment) device — which monitors the performance of all available connections in real time: latency, jitter, packet loss, and bandwidth utilisation. An SD-WAN controller in the cloud provides centralised management and policy enforcement across all sites.

Traffic policies define how different types of traffic should be handled. Microsoft Teams calls, for example, are latency-sensitive and should use the lowest-latency available path. Large file transfers are less sensitive to latency and can use a secondary, lower-cost path. SD-WAN applies these policies automatically without requiring manual configuration changes at each site.

Hybrid WAN: Combining Different Connection Types

One of SD-WAN's key advantages is its ability to work with mixed connection types. A business with leased lines at its main office, FTTP at branch offices, and 4G backup at smaller locations can use SD-WAN to manage all of these as a unified network. Each site uses the best available connection type, and SD-WAN handles the complexity of routing across different circuits.

This is also where SD-WAN delivers cost savings. Where businesses have replaced expensive MPLS circuits with cheaper broadband connections without sacrificing reliability, SD-WAN provides the application-aware routing and failover that makes lower-cost circuits viable for business-critical traffic.

Cloud-Direct Breakout

SD-WAN can be configured to provide local internet breakout at each site for cloud application traffic — sending Microsoft 365, Salesforce, or other SaaS traffic directly to the internet rather than routing it back to a central location first. This reduces latency for cloud applications significantly, which is particularly impactful for video conferencing and real-time collaboration tools.

Security policies are enforced at each breakout point through integration with cloud-based security services — preventing the security gaps that unrestricted local breakout would otherwise create.

AMVIA's Managed SD-WAN Service

AMVIA designs the SD-WAN architecture for your specific environment, selects appropriate hardware for each site, and manages the deployment and ongoing operation. All sites are monitored via AmviaIQ. Configuration changes, policy updates, and performance optimisation are handled centrally by AMVIA's network engineers without requiring a site visit for each change.

AMVIA works with SD-WAN platforms from leading vendors and selects the right platform based on your network scale, the number of sites, and your specific performance requirements. The managed service includes monthly performance reports, proactive fault management, and quarterly review meetings.

Migration from MPLS

Many businesses migrating to SD-WAN are coming from legacy MPLS WAN contracts. AMVIA manages this migration carefully — typically running SD-WAN in parallel with the existing MPLS circuit during a transition period, then cutting over once the new configuration is validated. Contract timing is reviewed to ensure the migration aligns with MPLS expiry where possible to avoid unnecessary dual-running costs.