Menu
close
Call +44 (0)20 3005 4440
Intersys Logo
+44 (0)20 3005 4440
Menu
Close

Managed IT Support

A Reasonable, Fixed Monthly Fee for All Your IT Needs
Managed IT Support Provider

Consulting Services

The High Level IT Consulting Services You Need to Transform Your Business
Get IT Consulting Services

Cyber Security

A Comprehensive Range of Cyber Security Services for Robust, Industry-Leading Protection
Get Cyber Security Services

IT Solutions

Whatever your IT needs, we'll create a tailormade solution for you
Get IT Solutions

Cyber Security Company London

From our offices in Leadenhall Market, London EC3V, Intersys helps businesses across all sectors develop robust cyber security. Our clients are 10x less likely to suffer attacks than the national average

Are You Suffering from a Cyber Attack Right Now?

We can help shut down cyber criminals, and protect and recover your data. Call us now on +44 (0)20 3005 4440.

The London Cyber Security Experts

The threat of cyber crime is increasing – relentlessly. And businesses in the capital are at the front end of the onslaught from cyber criminals.

Intersys is an ISO 27001-certified cyber security company in London helping organisations across all sectors firmly shut out cyber crime and protect their data and reputations.

Delivering cyber risk and IT services from Leadenhall Market in the heart of the City, we have over 25 years of experience providing cyber security to some of the world’s most highly regulated businesses.

Our services enjoy an exceptionally high retention rate – 94% compared to an industry average of 77%. Our cyber security expertise is regularly quoted in the nation’s media, from the Guardian to Cybersecurity Magazine and other sector-specific publications.

For a threat as existential as cyber crime, you need more than ‘a safe pair of hands’ – you need truly exceptional service from a specialist London provider with a track record of success in your sector. We are that provider.

Please read on to find out more about us. If you would like help assessing what your business might need in terms of security, see our page The Cyber Security Pyramid of Needs.

Cyber Security Case Studies in Your Sector

As a cyber security company in the nation's capital, we provide comprehensive services to dozens of clients in the capital, in sectors as diverse as life sciences, pharmaceuticals, the media, mining and engineering, education, renewables and financial services.

Here’s some recent projects showing our cyber security services across various industries in the capital.


Inside the M25? Get these Enterprise Cyber Security Services

From breach response services to fully managed security, our London-based cyber security company will help keep you safe. To get a greater understanding of what you might need, see our page featuring the Hierarchy of Cyber Security Needs pyramid. Please note: as well as delivering cyber risk services, we also provide full MSP services for London businesses.

Cyber Security as a Service (CSaaS)

Our full, cloud-based cyber security as a service. This includes complete cyber security protection, incident response, risk management and more.

Cyber Security Audit

Ask for a comprehensive analysis and review of your IT, to detect threats and vulnerabilities and weed out any practices that are putting you at risk.

Breach Response

A rapid response service. We will stop any breaches, assess damage, perform a security audit and update your recovery plan.

Cyber Essentials Assessment

Stay safe and competitive with our complete service. We’ll guide you through the whole Cyber Essentials process from assessment to certification.

PEN Testing

Ethical hacking to stress-test your systems and understand the vulnerabilities in your systems, networks and websites.

Cyber Security Training

One of the best defences against cyber crime is a security-aware workforce. Our team will encourage your people to adopt practices that keep you safe.

Why Clients Choose Our London Cyber Security Company

All-in-one provider

Everything from One Provider

We’re more than cyber security. Get a joined-up approach with our IT support and services: MSP, IT infrastructure services and more.

Cyber Resilient IT Services

We are an ISO27001-certified, Cyber Essentials Plus cyber security provider. Make sure you work with a properly accredited partner.

Keeping London Compliant

We are experienced in helping clients in London navigate GDPR, DORA and other frameworks for highly regulated industries.

First Choice for the City

We are the first-choice cyber security company in London for organisations in financial services, insurance and FinTech.
Best in Class

Service Over Sales Ethos

Many cyber security firms focus on sales, with little technical knowledge at the top. Our leadership team include cyber risk specialists.

Every Industry Catered For

With nearly 30 years in the industry, we have a great depth of experience helping all sectors with cyber security, from NGOs to blue chips.
Lloyds Building, London
Sydney, Australia
Intersys Management Team in London
The Gherkin, London
Mumbai Cityscape, India

Based in the Heart of London, Serving You Within the Hour

From our London Cyber Security HQ in the City, Intersys serves clients right across the capital. We can provide cyber security consultancy and services in London face to face, solving your problems on location; and we provide rapid remote support where applicable.

Many of the most heavily regulated industries in the UK sit within the M25 corridor. Our City of London-based team knows the territory and will ensure your cyber security meets the requirements for your industry.

Our business began close to 30 years ago, when our founder provided on-site IT support to financial services clients in London from his Triumph motorbike. We are now a team of over 50, continuing to serve the Square Mile, Canary Wharf, Mayfair, Victoria, London Bridge, the Shard Quarter and all commercial centres.

The UK’s Best IT Support and Service Provider

(According to Almost Every Intersys Client)

140+
live clients
94%
client retention rate (industry avg 77%)
8.6years
average length of client relationship
21mins
avg response time (industry avg 57min)
146mins
avg resolution time
28+
years in the business
Current Service Levels (3620 tickets/month). SLA Details >

We are the Media’s Go-To Cyber Security Company for London and the South

Intersys is a prominent voice on cyber security across London. Our senior leaders speak to publications such as The Guardian, Commercial Risk, Cybersecurity Magazine and the Insurance Times about strategies for managing IT risk. Why does this matter? Because trusted publications and brands come to us for advice on cyber security. It’s a powerful trust signal that you should too.

Certified, Trusted, Reliable

We partner with leading tech providers and industry bodies

Where to Find Your London Cyber Security Partner

In 2024, Intersys deepened its service offering in the capital by opening its cyber risk and IT office in the City of London. Our headquarters are situated on the 1st Floor, 29/30 Leadenhall Market, EC3V 1LR, right beside the iconic Lloyd's Building. Intersys' central location places us within a comfortable 10-12 minute stroll from several Underground connections including Bank/Monument, Liverpool Street, Aldgate and Tower Hill stations. For those arriving via mainline services, we're conveniently positioned less than 10 minutes' walk from Liverpool Street, Fenchurch Street and Cannon Street stations. Multiple bus routes serve our location, with stops along Bishopsgate, Gracechurch Street and the Liverpool Street Bus Station hub.

Common Questions Answered

What cyber security certifications and frameworks do you follow?
Our ISO 27001:2022 certification demonstrates Intersys' commitment to international standards for information security management. As a leading London cyber security consultancy, we implement the globally recognised NIST Cybersecurity Framework, structured around five essential functions: Identify, Protect, Detect, Respond and Recover. This strategic approach ensures comprehensive security integration within your organisation's broader risk management strategy, particularly valuable for London's financial and enterprise sectors.
How does Intersys safeguard sensitive information within London's regulated industries?
For London's highly regulated sectors, we deploy robust protection including end-to-end encryption, multi-factor authentication protocols and zero-trust architecture frameworks. Our sophisticated threat detection systems continuously monitor your environment in real-time, whilst secure data segmentation and stringent access controls restrict system access to authorised personnel only. We ensure we regularly conduct thorough penetration testing and vulnerability assessments to fortify your security stance against evolving threats targeting businesses.
How does your cyber security company address compliance requirements?
As specialists in cyber risk and IT services for heavily regulated industries across London, we conduct comprehensive risk assessments during onboarding to identify specific compliance needs. We regularly review and audit compliance requirements across various sectors, ensuring our clients maintain adherence to crucial regulations. Our expertise covers GDPR, DORA and NIS2 compliance, along with regulatory frameworks from bodies such as the MHRA and FCA that are particularly relevant to London's financial and healthcare sectors.
What continuous monitoring capabilities does your Cyber Security as a Service (CSaaS) provide?
Our CSaaS offering includes a fully-equipped security operations centre delivering uninterrupted 24/7 monitoring and rapid incident response capabilities essential for London's round-the-clock business environment. This service provides immediate threat detection, continuous intelligence gathering and efficient escalation protocols. Our dedicated expert response teams stand ready to address potential security incidents with the speed and precision that London's blue-chip companies demand.
Which advanced threat detection technologies do you employ?
We harness sophisticated AI and machine learning algorithms to develop predictive threat models and conduct advanced behavioural analytics tailored to London's unique threat landscape. Our AI-powered solutions incorporate intelligent threat detection, predictive risk scoring and adaptive incident response mechanisms that continuously learn from each interaction. Through our global intelligence partnerships, we maintain vigilance against emerging cyber security challenges that could impact London's business community.
How do you address the unique cyber security challenges facing London's financial services sector?
As a specialist cyber security company in London, we understand the distinct threats targeting the City's financial institutions. Our bespoke security frameworks addresses specific requirements for financial data protection, trading platform security and regulatory reporting obligations. We work closely with institutions to implement controls that satisfy both FCA and PRA requirements, while maintaining operational efficiency and resilience against sophisticated financial sector attacks common in global financial centres like London.
What experience does Intersys have supporting London's critical infrastructure organisations?
Our extensive experience includes protecting essential London infrastructure across healthcare, pharmaceuticals, public bodies, energy and many more sectors. As a cyber security company working in London, we understand the interconnected nature of the capital’s critical services and implement security measures that balance accessibility with robust protection. Our consultants bring sector-specific expertise to each engagement, ensuring that security controls address both the technological and operational aspects unique to London's infrastructure networks and the specific threat actors targeting them.

Talk to Us Now

Chat to a cyber security expert at Intersys
linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram