UK Network Latency: London vs Manchester vs Edinburgh vs Dublin Compared
VP Pulse runs live latency probes from four UK cities. This guide explains what network latency is, why it varies across Britain, and what's normal for UK infrastructure.
What Is Network Latency?
Network latency is the time it takes for a data packet to travel from one point to another and back β measured in milliseconds (ms). It is distinct from bandwidth (how much data can flow) β a high-bandwidth connection can still have high latency. For interactive applications, latency is often more important than bandwidth: a video call on a high-latency connection feels broken even if the total data rate is adequate.
Why Latency Varies Across the UK
The UK's internet backbone is heavily centralised in London. LINX (London Internet Exchange) is one of the largest internet exchanges in the world, and most UK ISPs peer there. Traffic between Manchester and Edinburgh often transits via London, adding unnecessary round-trip distance.
Physical distance is the hard floor on latency β light travels approximately 200km per millisecond in fibre (accounting for the refractive index of glass). London to Manchester is 260km, suggesting a theoretical minimum of ~1.3ms; real-world values are 5β15ms due to routing, switching, and protocol overhead. London to Edinburgh is 530km β a minimum of ~2.7ms, with real-world values of 10β25ms.
VP Pulse's Four UK Probe Cities
London
As the hub of UK internet infrastructure, London latency to major destinations is typically the lowest in the UK. London-based probes benefit from direct LINX peering and multiple undersea cable landings (TAT-14, FLAG, and others connecting to mainland Europe and the US). Typical latency to major cloud providers: AWS eu-west-2 (London): 3β8ms; Azure UK South: 2β6ms; Google Cloud europe-west2: 4β9ms.
Manchester
Manchester is the UK's second-largest internet hub, with MANAP (Manchester Network Access Point) providing regional peering. Northern businesses benefit from Manchester-centric routing for some destinations. Latency to London from Manchester is typically 12β20ms; to LINX-peered services is 15β25ms.
Edinburgh
Scottish internet traffic historically transited England, but SCOTIX and other Scottish IXPs are growing. Edinburgh latency to London is typically 20β35ms. For Scottish businesses, choosing UK hosting with Scottish edge nodes (where available) can reduce latency to local users meaningfully.
Dublin
Dublin is the primary internet hub for Ireland and an important node for transatlantic traffic. The DublinβLondon subsea cable is a critical piece of UK-Ireland internet infrastructure. Many major cloud providers (AWS eu-west-1, Azure North Europe) host large regions in Dublin. Cross-Irish-Sea latency is typically 15β25ms from UK locations.
Interpreting VP Pulse Latency Data
VP Pulse runs probes every few minutes and shows current latency alongside a 30-day sparkline. Normal latency varies by destination and time of day β evening congestion typically adds 5β15ms to residential ISP latency. Sudden spikes (>50ms above baseline) or sustained elevation over hours often indicate upstream congestion or routing issues that may escalate to a broader outage.
Latency for UK Financial Services
In financial services, particularly algorithmic trading, latency is measured in microseconds, not milliseconds. Co-location in Equinix LD4 (Slough) or Telehouse (Docklands) provides sub-millisecond access to London Stock Exchange and ICE Futures Europe. VP Pulse's city-level probes are designed for infrastructure health monitoring, not trading-grade latency measurement.
View live UK latency data from all four probe cities on the VP Pulse dashboard, updated every few minutes.