A leased line is a private, dedicated fibre connection that ensures you have guaranteed symmetrical speeds without sharing, congestion, or slowdowns during peak evening hours. While business broadband is shared, a leased line is fully yours, with SLAs that ensure 100% uptime and rapid fault fixes.
However, with so many leased line London providers, it is quite difficult to estimate which one is more suitable. And that is where this guide comes in handy. We have compared the best leased line solutions in London to help you choose the one that fits your needs.
Let ComparedBusiness UK get you free, no-obligation quotes from the top leased line providers in London and start saving now.
Key takeaways
1. A leased line in London provides a dedicated and uncontended fibre circuit that delivers symmetrical speeds and guaranteed uptime, in contrast to shared broadband.
2. Prices for London leased lines generally start at £167/month for 100 MB to £995+/month for 10 GB.
3. With pricing starting at £167/month, Stream Networks covers over 30 fibre networks, making it an attractive option for cost-conscious businesses.
4. Vorboss is the business internet provider in London, engineered with performance in mind, providing up to 100 GB on a purpose-built network that automatically compensates for downtime.
5. Colt is a multinational Business-to-Business (B2B) provider of high-bandwidth Dedicated Internet Access up to 100 GB, featuring a 99.99% SLA and available in 40+ countries.
6. BT is the UK’s number-one market-share leased line provider, starting from £395/month and able to offer speeds between 30 MB and 10 GB.
7. The right leased line provider for your London business will vary according to how big your team is, your budget and required speeds are, and the level of SLA support you demand.
8. ComparedBusiness UK allows you to compare several leased line providers in London for free. This will save you not only time but also money.
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Best Leased Line Providers In London: A Quick Overview
Not sure where to start? Here is a snapshot comparative overview of the four best leased-line providers in London; take a look at this chart before considering all the details.
| Provider | Best For | Speed Range | Starting Price | SLA Uptime |
|---|---|---|---|---|
|
Stream Networks |
SMEs and cost-sensitive businesses |
100 Mbps to 10 Gbps |
From £167/month |
99.99% |
|
Vorboss |
Businesses in London |
1 GB to 100 GB |
Contact sales team |
Auto compensation |
|
Colt |
Enterprises |
1 Mbps to 100 Gbps |
Contact sales team |
99.99% |
|
BT |
Medium to large businesses |
30 Mbps to 10 Gbps |
From £395/month |
100% |
1. Stream Networks
Overview:
UK connectivity specialists Stream Networks provide ultrafast fibre Ethernet leased lines throughout London, all with access to 30+ fibre networks.
One of its key strengths is the breadth of access to the network, which enables it to provide extremely competitive pricing while maintaining a high-quality service level. That is why Stream is an ideal choice for London businesses seeking a reliable and speedy leased line solution at the lowest possible cost.
Key Features:
- We offer 30+ fibre networks across London.
- It provides up to 10 GB of speed.
- The main feature of this plan is the 99.99% uptime, with a fully automatic failover to a backup connection.
- Improved SLA of a 6-hour fix, with UK support available 24/7.
- It offers 8 static IP addresses.
- Symmetrical upload and download speeds.
- A Juniper SRX router is included.
- It offers DDoS scrubbing and cybersecurity protection.
- It comes with ADSL/FTTC business broadband backup.
Best For:
Stream Networks is the best place for London SMEs, growing firms, and those that want to be commercially strong at all levels. Stream provides so much convenience for businesses that are in areas with 1 or 2 available carriers; Stream will be able to provide a better price than going directly to one of those providers due to its wide network access.
Pros and Cons:
| Pros | Cons |
|---|---|
|
Pricing starts from £167/month |
Pricing on the website might be different in your location |
|
It has over 30+ fibre networks |
It is less recognised than competitors like BT or Colt |
|
6-hour fix SLA with 24/7 UK support |
Stream just offers connectivity; it is not a completely managed IT suite |
|
It offers a router, static IPs, and broadband backup |
|
|
Scalable from 100 MB to 10 GB |
|
|
It has an availability checker for London postcodes |
|
Pricing:
| Speed | Monthly Price | What’s Included |
|---|---|---|
|
100 MB |
£167 |
The service includes 8 static IPs, unlimited usage, 24/7 support, a 6-hour fix SLA, backup, and a Juniper router |
|
1 GB |
£280 |
The service includes 8 static IPs, unlimited usage, 24/7 support, a 6-hour fix SLA, backup, and a Juniper router |
|
10 GB |
£995 |
The service includes 8 static IPs, unlimited usage, 24/7 support, a 6-hour fix SLA, backup, and a Juniper router |
Note: Prices subject to availability at your London postcode. For a detailed quote for your address, Stream suggests that you use its online checker.
2. Vorboss
Overview:
Vorboss is a London internet provider that has built fibre networks directly for businesses across the capital. Vorboss provides dedicated internet access (DIA), also known as leased lines, built specifically for business and delivered over 600 km of fibre installed across London.
Whereas many providers reuse residential-grade infrastructure, Vorboss designed its network for business from the ground up, including steel-jacketed cable joints and locked-down chambers to reduce the risk of outages. Vorboss is a seriously compelling option for London businesses in need of enterprise-grade connectivity.
Key Features:
- It has a purpose-built 600 km London fibre network.
- It offers 1 GB to 100 GB speeds.
- Consistent upload and download speeds, with both being symmetrical at all times.
- It also offers automatic compensation for downtime over 4 minutes.
- There is no bandwidth pooling; rather, each customer has their own connection.
- Vorboss is ISO 9001, ISO 45001, ISO/IEC 27001, ISO 14001, and ISO 22301-certified.
- It has an in-house support team based in London.
- It offers DDoS protection and cybersecurity.
- It manages failover and has diverse line options.
- For a fast go-live option, the Rapid Install is available.
Best For:
If your business is based in London and requires the highest levels of reliability, speed, and support, then Vorboss is arguably the best leased-line provider. It is particularly made for fast-growing startups, tech companies, media businesses, and any London organisation that cannot afford downtime.
It becomes a great option, especially when coupled with its automatic compensation policy, which we rarely see in the market, as it shows true confidence that the quality of your network will perform.
Pros and Cons:
| Pros | Cons |
|---|---|
|
This network, built specifically for London, does not use any repurposed residential infrastructure |
Only London coverage; not for businesses out of the capital |
|
Automatic credit for downtime of more than 4 minutes |
Pricing on request, not published upfront |
|
Future-proof connectivity speeds up to 100 GB |
Its premium positioning may not be suitable for small or budget-conscious businesses |
|
No call centre, just a team of London-based experts |
|
|
Secured by multiple ISO certifications |
|
|
Trusted by brands across London |
|
Pricing:
Vorboss does not have standard pricing available on its website, as all prices are bespoke to the business location, speed required, and contract terms; they do not publish standard pricing.
1 GB, 10 GB, 25 GB and 100 GB speeds are available. Vorboss can be contacted directly for a quote, or you can compare Vorboss pricing with other top leased line providers in London at ComparedBusiness UK.
3. Colt
Overview:
Colt is an international telecoms and digital infrastructure provider, supplying enterprise-grade Dedicated Internet Access (DIA), more commonly known as a leased line, throughout the UK, Europe, Asia, and the USA.
Colt has been a trusted choice for large enterprises and multi-site organisations globally, leveraging over 30 years of experience, a landscape of services available in 40+ countries, and SLAs that provide consistent performance worldwide. It has a significant presence in London, with its own fully owned and operated network providing connectivity of up to 100 GB.
Key Features:
- It offers 100% uncontended bandwidth on Dedicated Internet Access (DIA).
- Symmetric speeds ranging from 1 MB to 100 GB.
- 99.99% guaranteed SLA uptime.
- Colt has a presence in over 40 countries, with offices in more than 50 cities.
- It has active/active or active/standby failover availability.
- It comes with a Network as a Service (NaaS) option, dynamic provisioning, and hour-based billing.
- It has 180+ connectivity partners for expanded global reach.
- It offers real-time traffic and SLA reporting through the online performance portal.
Best For:
Ideal for London-based enterprises, financial organisations, multi-site organisations, and global businesses. Use Colt if your business requires one provider that can provide consistent, enterprise-level connectivity across many offices, be it in London or Europe. It also remains a great option for those businesses looking to put cloud application performance first, especially Microsoft 365 workloads.
Pros and Cons:
| Pros | Cons |
|---|---|
|
It offers an SLA of 99.9% at the enterprise level, with 100% commitment to uncontended bandwidth |
You need to contact its sales team for a quote, and the price is generally higher than that of smaller providers |
|
International coverage in 40+ countries |
Not an ideal solution for small businesses |
|
It offers speeds up to 100 GB |
Its global focus makes it feel less personal for local London SMEs |
|
It offers prioritisation for the Microsoft 365 cloud |
The onboarding process can be more complicated for smaller businesses |
|
Allows NaaS flexibility while reporting performance in real time |
|
|
More than 30 years of experience and a good reputation in the industry |
|
Pricing:
Colt does not list standard pricing for its Dedicated Internet Access service, as prices depend on the particular business, location, speed needs, and contract arrangement. It is positioned as enterprise software, and as such, the pricing reflects a premium over smaller independent providers.
If you are a London business, then it’s worth requesting a quote and comparing it against more locally orientated providers through ComparedBusiness UK to make sure you are getting genuine value for your use case.
4. BT
Overview:
BT is the UK’s largest and most recognisable telecommunications provider, while its BTnet leased line is one of the more established dedicated internet access products available.
BT has the widest network coverage available for London businesses, and its brand recognition itself carries a perceived level of trust and accountability. BTnet targets medium- to large-sized businesses looking for fast and reliable connectivity, with a 100% availability SLA and a 5-hour target fix time.
Key Features:
- It is a market-leading UK leased line provider.
- It offers speeds up to 30 MB and 10 GB.
- Guaranteed SLA of 100% availability with no downtime.
- It offers a target 5-hour fix time for faults.
- It offers BTnet security variables such as the next-generation layer 7 firewall, malware block, URL filter, and intrusion detection.
- Direct private peering for cloud applications such as Microsoft, Google, Apple, and Amazon.
- It also offers the BTnet WiFi add-on for £10/month.
- It can expedite speed on demand as your business evolves.
Best For:
It is ideal for medium and large enterprises, public sector organisations that appreciate the security and reliability of the UK’s largest network, or businesses that already have a relationship with BT. BTnet is also a good choice for organisations needing integrated security, as it has a comprehensive security stack built into the core service.
Pros and Cons:
| Pros | Cons |
|---|---|
|
It is the UK's biggest leased line provider |
It is not as price-competitive for small businesses |
|
100% SLA availability with a 5-hour fix time |
10 GB pricing is quote-based and often costlier |
|
The BTnet security suite is included |
|
|
Direct private peering for cloud performance |
|
|
It has a proven, nationwide network infrastructure |
|
|
Its speeds range from 30 MB to 10 GB |
|
Pricing:
| Plan | Speed | Starting Price | Best For |
|---|---|---|---|
|
BTnet |
30 MB to 1 GB |
From £395/month (60-month contract) |
B2B |
|
BTnet 1 GB+ |
1 GB to 10 GB |
Call the sales team for a quote |
Enterprise needs |
Note: The prices shared above are without VAT. For the installation, a site survey will be carried out. The BTnet entry plan has a 5-year minimum term for contracts. Request a custom offer from the BT sales team or use ComparedBusiness UK for a quote.
How To Find The Best Leased Line Provider In London: A Checklist
The number of possible leased line providers is vast; it can be difficult to determine a competent leased line provider in London. Follow this easy checklist to make the best decision:
1. Know Your Bandwidth Needs: Four staff on the connection? When do you use cloud applications, VoIP, video conferencing, or large file transfers?
2. Check Postcode Coverage: Not all providers operate in every London address. So, you must always run an availability check.
3. SLAs: Make sure you dig deeper than just headline uptime percentages. Verify the fix time (4-hour vs 6-hour), and determine if the payment is automatic or requires a claim.
4. Consider Scalability: How will your business scale? Opt for an option that allows you to upgrade from 100 MB to 1 GB or more without building a new line.
5. Ask How Long Installation Takes: Standard leased line installations in London are 30 to 90 working days. Find out about expedited options if you need connectivity fast.
6. Total Cost: In addition to the monthly fee, check whether there is an installation charge, equipment charges (is a router included?), and if IP addresses are included.
7. Support: Smaller providers have some disadvantages, and the biggest one is limited support. The UK-based 24/7 support is ideal. Find out if you are given a dedicated account manager or the general helpdesk queue.
8. Check Contract Length: The majority of leased line providers offer 24- to 60-month contracts. The shorter contracts are usually more flexible but are pricier.
9. Do Not Sign The First Quote You Receive: Always get at least three quotes. You can also compare multiple offers side by side through a comparison service like ComparedBusiness UK to ensure you are gaining the best deal.
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Do you want to learn more about the cost of leased lines? Then see our guide: Leased Line Costs & Prices (2026 Guide) |
Find The Best Leased Line Providers In London With ComparedBusiness UK
Finding the best leased line in London is a time-consuming task that you will do on your own. That is, there are dozens of providers with varying pricing structures, speed tiers, SLAs, and contract terms.
That is why ComparedBusiness UK makes things so simple. ComparedBusiness is a comparison platform for business products and services in the UK that allows you to compare the best leased line providers in London calls quickly, clearly, and free.
Here is how it works:
- Fill in our quick quote form and tell us about your needs and budget.
- We will connect you to the ideal leased line providers in London based on your needs.
- We will give free, no-obligation quotes from multiple suppliers.
- Compare and select providers that suit your business.
Whether you are an SME or a large enterprise that requires enterprise-grade connectivity with a strong SLA, ComparedBusiness UK has the suppliers and solutions to help you choose correctly and quickly.
FAQs
A typical leased line installation in London can take anywhere from 30 to 90 working days. This is all dependent on the distance from the closest fibre point and if there are any new ducting agreements needed and access arrangements at your building. For an expedient connection, enquire with your provider if there’s a solution for temporary use.
ComparedBusiness UK is a free, no-obligation quote comparison service for London-based leased line providers. Just let us know your needs, and we will match you with trusted providers so you can compare costs and services side by side at no cost.
For small businesses that take advantage of cloud applications, VoIP calls, video conferencing, or real-time data, a leased line can be well worth the investment. The quality and speed of the internet literally affect productivity and customer experience.
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