Proactive IT Support London Businesses Rely On Daily

Managed IT support, cybersecurity and Microsoft 365 management for businesses across London. Fast remote support, responsive onsite assistance and reliable day-to-day IT services organisations depend on to keep operations running smoothly.

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 5.0 
   Top Rated Service
 verified by Trustindex 
 Trustindex verifies that the company has a review score above 4.5, based on reviews collected on Google over the past 12 months, qualifying it to receive the Top Rated Certificate.

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Reliable IT support starts with a conversation. Tell us how we can help.

Complete IT Support for London Businesses

From Microsoft 365 and cloud to cybersecurity and connectivity, we cover every layer of your IT stack with a single, accountable team.

Fully Managed IT Support

Our managed IT services are designed to provide responsive day-to-day support alongside proactive maintenance and monitoring.

Unlimited remote IT support
Device and software troubleshooting
User account and access management
Proactive monitoring and maintenance
Ongoing technical guidance

On-Site IT Support

We provide on-site IT support across London for businesses requiring hands-on technical expertise.

Hardware diagnostics and deployment
Network troubleshooting
Office moves and site setup
Wi-Fi, firewall and switching support
Infrastructure upgrades

Microsoft 365 & Cloud

We help London organisations modernise and secure their cloud environments.

Microsoft 365 management
Email migrations and support
SharePoint and Teams configuration
Cloud backup and disaster recovery
Hybrid and remote working solutions

Cybersecurity Services

Cybersecurity integrated into every service we deliver.

Endpoint protection and monitoring
Patch management
Firewall configuration
Multi-factor authentication (MFA)
Microsoft 365 security hardening
Cyber Essentials support

Connectivity & Telecoms

Reliable communication and connectivity solutions designed for modern businesses.

Business broadband
Leased lines
4G/5G failover connectivity
VoIP phone systems (3CX)
Secure remote access solutions

Backup & Disaster Recovery

Protect your business against downtime, data loss and cyber incidents with resilient backup and disaster recovery solutions designed to keep your organisation operational.

Microsoft 365 and server backup solutions
Immutable and offsite backup protection
Rapid recovery for files, systems and workloads
Business continuity and disaster recovery planning
Backup monitoring, testing and management

Specialist IT Support Across London

We provide managed IT support across Greater London, supporting organisations ranging from SMEs to enterprise environments.

IT Support Canary Wharf

enterprise IT services for finance, fintech and corporate organisations.

IT Support Central London

supporting businesses across Westminster, Holborn, Soho and surrounding commercial districts.

IT Support City of London

security-focused IT support for financial, legal and professional services firms operating within the Square Mile

Sector-Focused IT Support in London

We support organisations across a wide range of sectors throughout London:

Accounting & Professional Services

Construction

Education

Logistics & Warehousing

Manufacturing

Client Reviews:

Trusted IT Support for Businesses & Schools

      
 Excellent5.05 reviews
 5.0
 Excellent5 reviews
  Write a review 
 
 
 
   
 
 
      Posted on Google  
   
   Tech Redhall 
 22 October 2026
 
 
 Trustindex verifies that the original source of the review is Google. We have had a very positive experience with CSLN Group at Redhall Primary School. The team has been professional, reliable and supportive throughout, and their commitment to providing a high-quality service has been greatly appreciated.

Communication has been excellent, and the staff have always been approachable and helpful. We would happily recommend CSLN Group to other schools and organisations looking for a dependable and professional service.
  
 
     Posted on Google  
   
   School of Coding 
 6 October 2026
 
 
 Trustindex verifies that the original source of the review is Google. We’ve been really pleased with the support from CSLN Group. The team are approachable, responsive and explain things clearly. From day-to-day IT support to larger infrastructure projects, they’ve taken the time to understand our needs and keep things running smoothly. Highly recommended.
  
 
     Posted on Google  
   
   Lucinda Knight 
 8 May 2025
 
 
 Trustindex verifies that the original source of the review is Google. CSLN Group Ltd recently installed new security cameras and a detection doorbell to my home. They have been extremely friendly and helpful throughout, making sure I was involved with the positioning of the camera locations and demonstrating the mobile phone app to me. I can highly recommend them to anyone who is looking for extra home security.
  
 
     Posted on Google  
   
   J Knight Design Ltd 
 29 April 2025
 
 
 Trustindex verifies that the original source of the review is Google. We have had CSLN as our IT support for over a year now and we couldn’t be happier with the professional, quick and responsive service they offer. CSLN provide a collaborative, friendly and professional approach to their work and clients. Their depth of knowledge has enabled them to consistently meet our requirements and keep us up to date with the latest security and software’s. We look forward to continuing this collaborative journey with CSLN as our IT partners. We would highly recommend.
  
 
     Posted on Google  
   
   Claire Cook 
 9 March 2025
 
 
 Trustindex verifies that the original source of the review is Google. I had a fantastic experience with CSLN Group Ltd! Their team is professional, responsive, and truly dedicated to delivering high-quality work. They went above and beyond to meet my needs, and their customer service was excellent. Highly recommend them for anyone looking for reliable, top-notch service!
  
 
 
  
 
 
   Verified by Trustindex  Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more

Over the past three years, CSLN Group has been a key strategic partner in shaping and delivering our IT strategy. Their guidance and technical expertise have supported major projects including cloud transitions, infrastructure upgrades, and improved cybersecurity.

Their collaborative approach and deep understanding of our needs have enabled us to build a more resilient and future-ready IT environment. CSLN’s support has allowed our internal team to focus on service development with confidence in the stability and performance of our core systems.

We highly value our partnership with CSLN Group and would recommend them without hesitation.

Head of Information Technology, Hills Road Sixth Form College

We have had a very positive experience with CSLN Group at Redhall Primary School. The team has been professional, reliable and supportive throughout, and their commitment to providing a high-quality service has been greatly appreciated.

Communication has been excellent, and the staff have always been approachable and helpful. We would happily recommend CSLN Group to other schools and organisations looking for a dependable and professional service.

Red Hall Primary School

Frequently Asked Questions

Do you provide IT support in London?

Yes. CSLN Group provides managed IT support for businesses, schools, colleges and charities across London. We combine remote assistance, proactive monitoring and onsite visits to keep your systems secure, reliable and running smoothly.

Can you provide onsite IT support across London?

Yes. We arrange onsite IT support across Central London, the City of London, Canary Wharf and the wider Greater London area. Visits can cover hardware faults, network troubleshooting, equipment installations and infrastructure upgrades. We can also arrange scheduled onsite support as part of your agreement.

Do you support small businesses in London?

Yes. We help small and growing businesses access dependable IT support without employing a full internal IT team. Our services can cover everyday troubleshooting, Microsoft 365, cybersecurity, backups and connectivity, with support tailored to your organisation’s needs.

Can you support businesses with multiple offices or hybrid teams?

Yes. We support organisations with staff working across London offices, other UK locations and remotely. We can manage user accounts, devices, Microsoft 365 and secure remote access, helping employees work effectively wherever they are based.

What are your IT support hours?

Our support team is available from 6am to 10pm, seven days a week, helping organisations before, during and after the usual working day. We prioritise requests according to their urgency and impact, with response commitments and onsite arrangements detailed in your support agreement.

Can you manage Microsoft 365 for our London business?

Yes. We manage Microsoft 365 environments, including Outlook, Exchange Online, Teams, SharePoint, OneDrive, user accounts and licensing. We can also assist with migrations, strengthen security settings and provide Microsoft 365 backup to help protect your business data.

Is cybersecurity included in your managed IT support?

Cybersecurity forms part of our managed IT approach. Your proposal clearly identifies the protection included, which can cover endpoint protection, patch management, proactive monitoring and Microsoft 365 security. Additional services can include managed detection and response, penetration testing, backup and disaster recovery.

Can you work alongside our internal IT team?

Yes. Our co-managed IT support gives your internal team access to additional capacity and technical expertise. We can assist with escalated issues, infrastructure projects, Microsoft 365, cybersecurity and holiday cover, with responsibilities agreed from the outset.

Can you take over from our existing London IT support provider?

Yes. We can coordinate the handover with your existing provider, review your systems and arrange the transfer of relevant documentation and administrative access. We agree the transition with you in advance to minimise disruption and maintain continuity of support.

Ready to get your IT under control?

Book a free, no-obligation IT health check with CSLN Group. Straightforward advice, practical recommendations and support from experienced engineers — without the hard sell.

Book Your Free IT Health Check

Call 0330 363 9976

      
 5.0 
   Top Rated Service
 verified by Trustindex 
 Trustindex verifies that the company has a review score above 4.5, based on reviews collected on Google over the past 12 months, qualifying it to receive the Top Rated Certificate.