Leased Lines in London
Dedicated, uncontended business internet across the capital, designed, delivered and managed by Sequential Networks from our own network and London data centres.
99.95% UPTIME SLA · 4-HOUR FIX · ISO 27001 & 9001 · TELEHOUSE & DOCKLANDS COLOCATION · UK SUPPORT
Leased lines in London give your business a dedicated, symmetrical fibre connection that is never shared with anyone else. Sequential Networks provides fully managed 100Mbps, 1Gb and 10Gb leased lines across Greater London, backed by a 99.95% uptime SLA, a 4-hour target fix time and our own colocation in Telehouse and Docklands. Fibre installations typically take 30 to 45 working days, with a rapid wireless option live in around 10 days when you need connectivity fast.
What is a leased line?
A leased line is a private, dedicated internet circuit that runs straight into your London premises, yours and yours alone. Unlike business broadband, which shares bandwidth with other users (a contention ratio), a leased line is uncontended: you get the full symmetrical speed you pay for, at all times.
For London businesses running cloud platforms, VoIP and video, trading and finance systems, large file transfers and hybrid teams, it is the connection that keeps you working when downtime is not an option.
London leased line speeds & pricing
| Speed | Best for | From |
|---|---|---|
| 100Mbps | Small and mid offices, VoIP, cloud apps | Request a quote |
| 1Gb | Growing teams, multi-site, file-heavy work | £149/month* |
| 10Gb | Finance, media, data-intensive operations | Bespoke quote |
*On-net 1Gb offer price, with free installation available (up to £2,500 towards the connection on a 36-month term). Final pricing depends on your postcode, bandwidth, contract length and any construction charges, so the accurate figure is always a quote for your exact address.
All lines include a managed router, static IP addresses and 24/7 monitoring as standard. Higher capacities up to 10Gb are delivered straight into your racks or offices where you need them.
Why choose Sequential Networks for your London leased line
Most London leased line providers resell someone else’s network. We do not. We design, deliver and manage connectivity on our own network, terminating in the capital’s key data centres that we operate ourselves:
- Our own London data centre footprint: colocation in Telehouse North, Telehouse West, Harbour Exchange and Canary Wharf, plus Central London and London North. Your connectivity terminates in the capital’s key carrier hotels, on infrastructure we operate.
- Our own network and resilient dark fibre reaching over half a million on-net UK premises, not a reseller.
- ISO 27001 and ISO 9001 certified (UKAS): security and quality independently audited, which matters for finance, legal and public-sector clients.
- A single supplier for the whole stack: leased lines, cloud, colocation, hosted VoIP, MPLS, SD-WAN and IT support.
- G-Cloud government-approved supplier and multi-award-winning for service and outsourcing.
- Genuinely local: a London number (020 3817 4835), named Solutions Consultants and engineers across the capital.
Leased line vs business broadband
| Business broadband | Leased line | |
|---|---|---|
| Bandwidth | Shared (contended) | Dedicated (uncontended) |
| Speeds | Asymmetric, up to | Symmetrical, guaranteed |
| Uptime | Best-effort | 99.95% SLA |
| Fix time | No guarantee | 4-hour target |
| Best for | Light use | Business-critical operations |
In a market as competitive as London, comparing on price alone misses the point. A leased line is built so your business keeps working when connectivity is the thing you cannot afford to lose.
Coverage & installation across London
We deliver leased lines right across Greater London, from the City (EC postcodes) and Canary Wharf and Docklands (E14) to Shoreditch and Tech City, Farringdon, Soho and Fitzrovia (W1), Westminster and the South Bank, and out across the M25.
- Fibre leased lines: typically installed in 30 to 45 working days, depending on availability and any excess construction charges at your postcode.
- Rapid wireless leased lines: where fibre civils or wayleaves would cause delays, common in central London, we can deliver a wireless circuit in around 10 days, ideal for new offices or as a diverse failover path.
- Resilience: diverse routing and self-healing failover keep you online if your primary circuit is disrupted.
Not sure what is available at your address? Send us your postcode and we will check what can actually be delivered before we quote.
Our SLA, support & resilience
Every London leased line is backed by:
- 99.95% uptime SLA with a 4-hour target fix time, monitored 24/7 from the UK.
- Proactive monitoring, so we often see and act on issues before they affect you.
- Managed router and configuration, set up correctly for the services you actually run (VoIP prioritisation, cloud, multi-site).
- DDoS protection and diverse routing options for business-critical and financial sites.
Built for London’s sectors
London runs on connectivity, and different sectors need different things from it. We design for that:
Finance & Insurance
Ultra-low latency, resilience and security for trading, file sharing and voice, with diverse entry points and multiple exchanges.
Professional Services
Bandwidth for content, large files and VoIP, with guaranteed fix times, high availability and strong data security.
Public Sector
Efficient, integrated networks for big-data projects, document management, remote services and citizen portals.
Business & Media
Heavy upload and download of large files, cloud and unified comms, with clear room to grow.
Manufacturing & Logistics
Reliable, secure links for field-force management and integrated supply-chain communications.
Complete connectivity & cloud solutions
A leased line is often the first step. Because we run the whole stack, we can build everything on top of it:
- Hosted VoIP and unified comms
- MPLS and SD-WAN for secure multi-site networks
- Public, private and hybrid cloud
- Central London, Canary Wharf and Telehouse colocation
- IT support and procurement
One supplier, one bill, one team that knows your whole setup.
Frequently asked questions
How much does a leased line cost in London?
On-net 1Gb leased lines in London start from £149/month, with 100Mbps and 10Gb priced on quote. Free installation is available (up to £2,500 towards the connection on a 36-month term). Final pricing depends on your postcode, speed, contract length and any construction charges, so the accurate figure is always a quote for your exact address.
How long does installation take in London?
A fibre leased line typically takes 30 to 45 working days, and can be longer in central London where excess construction or wayleaves are involved. If you need connectivity sooner, our wireless leased line option can be live in around 10 days.
Do you cover the City and Canary Wharf?
Yes. We cover the City of London, Canary Wharf and Docklands, Shoreditch, Farringdon, Soho, Westminster and Greater London out to the M25. Send us your postcode and we will confirm availability.
Is a leased line secure enough for finance and legal firms?
Yes. A leased line is a private, uncontended circuit rather than a shared connection, we are ISO 27001 certified, and we can add DDoS protection and diverse routing. Connectivity terminates in Telehouse and Docklands data centres we operate.
What happens if the line goes down?
Our London leased lines carry a 99.95% uptime SLA with a 4-hour target fix time and 24/7 monitoring, plus self-healing failover and diverse routing so you stay online if your primary circuit is disrupted.
Can you connect multiple London or UK sites?
Yes. We design multi-site networks using MPLS and SD-WAN, interconnected with our London data centres and cloud.
Ready to connect your London business?
Talk to our UK network team about a dedicated London leased line, from a single City office to a nationwide multi-site network. We design, deliver and manage it end to end, and right now you can get 3 months free when you sign up for a trial or consultation.
London: 020 3817 4835 · hello@sequentialnetworks.co.uk