Cyber security company in London
Penetration testing and IT security for London businesses: find and fix the weaknesses in your apps, cloud and processes, with a free retest after your fixes.
- Custom quote after a brief
- Free retest after fixes
Company-wide:★★★★★ 4.9+ on Clutch·250+ brands·10 offices
UnFoldMart is a cyber security company with an office at 32 London Bridge St, London SE1 9SG. We run authorised penetration tests of web apps, APIs, mobile apps, networks and cloud setups for London businesses, help you prepare for Cyber Essentials, SOC 2 and PCI DSS, and help answer customer security questionnaires. Every finding comes with severity and a fix, and the retest after your fixes is free. Meetings are by video in English; pricing is a custom quote after a short brief.
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Key facts
| Service | Penetration testing of web apps, APIs, mobile apps, networks, cloud and containers; vulnerability assessments; SOC 2 and PCI DSS readiness support; help with security questionnaires |
|---|---|
| Company | UnFoldMart |
| Office | 32 London Bridge St, SE1 9SG London, United Kingdom |
| Meetings | By video (in-person meetings only at our Frankfurt and Zürich offices) |
| Languages | First call in English; project calls by video in English |
| Time zone | UK time (GMT/BST); project teams are led from our international offices |
| Typical timeline | Scope and sign-off about 1 week · testing 1–4 weeks · report within 1 week · free retest when your fixes are ready (ranges, not guarantees) |
| Pricing | Custom quote after a short brief: fixed-scope test or assessment, or programme support. No price list. |
| Booking | Free 30-minute video call ↗ |
| Company-wide | 10 offices in 10 markets · 250+ brands · 500+ projects · 4.9+ on Clutch · 8 working languages |
IT security for London businesses
London is one of the world's largest financial and technology centres. Fintechs, insurers, media and SaaS companies are asked for proof of security by customers, partners and regulators, often as a recent penetration test report.
London at a glance
- IndustriesFinance, fintech, insurance, media, SaaS
- Data lawUK GDPR and the Data Protection Act 2018
- Baseline schemeCyber Essentials (NCSC)
- LanguageEnglish
- Time zoneGMT in winter, BST in summer
Fintech and financial services
Tests before launches, raises and partner checks.
SaaS and technology companies
Evidence for enterprise security questionnaires.
Professional services and media
External exposure, cloud and access reviews.
What our London penetration testers check
Pen testing of web apps, APIs, mobile apps, networks, cloud setups and containers.
Web apps
OWASP Top 10, ASVS, logic flaws.
APIs
Access control, data exposure, limits.
Mobile apps
OWASP Mobile Application Security.
Networks
External and internal.
Cloud setup
Access, exposure, encryption, logging.
Containers and Kubernetes
Images, cluster settings, permissions.
Our rules
Authorised testing only
Signed scope and window first.
Careful with your data
Only what scope needs.
Aligned, never certifying
We don't certify or audit companies.
Automated scan, penetration test or audit?
Three different things that are often confused. We run penetration tests and help you prepare for audits; we are not an auditor.
| Automated scan | Penetration test | Audit or certification | |
|---|---|---|---|
| What it is | A tool checks for known weaknesses | Security testers try to break in, manually and with tools | An independent auditor checks your controls against a standard |
| What it finds | Known issues and missing patches | Real, exploitable weaknesses, including logic and access flaws | Gaps in policies, processes and evidence |
| What you get | An automated list, often with false positives | A report with proof, CVSS severity and fixes, plus a free retest | An audit report or certificate |
| Who does it | Your team or any provider | Testers you authorise in writing, such as UnFoldMart | Accredited auditors only (not UnFoldMart) |
| Best for | Frequent checks between tests | Before launches, big contracts and audits, and at least once a year | Proving compliance, e.g. SOC 2, PCI DSS, ISO/IEC 27001 |
From finding to fixed
Every finding comes with steps to reproduce and a fix. The retest is free.
- Finding reportedWith steps and a fix.
- You fix itOr we fix it with you.
- Free retestWe check each fix.
- Retest letterProof of what's closed.
- Gap review
- Controls and evidence
- Security questionnaires
How a penetration test works
From the first call to the retest letter, with critical issues flagged at once.
- 1ScopeSigned, in writing
- 2TestingCritical issues flagged at once
- 3ReportWalkthrough call
- 4Free retestRetest letter
Timeline
| Phase | Typical duration | You get |
|---|---|---|
| Call | 30 minutes | Clear goals and next steps |
| Scope and sign-off | About a week | Signed scope, window and rules |
| Testing | 1 to 4 weeks | Critical issues flagged at once |
| Report and walkthrough | Within a week | Report with CVSS severity and fixes, explained on a call |
| Fix and free retest | When your fixes are ready | Retest letter to share |
Typical ranges, not a guarantee. Testing time depends on scope.
How to choose a penetration testing company in London
Six checks before you sign, whoever you hire.
Written authorisation and scope
Testing should start only after the system owner signs the scope, window and rules.
UnFoldMart: Signed scope and window before any test.
Manual testing, not just a scan
Ask how much of the work is manual and which methods they follow.
UnFoldMart: Manual testing aligned to OWASP ASVS and OWASP MAS.
A report your developers can use
Findings with proof, severity and fix steps.
UnFoldMart: CVSS severity, steps to reproduce and fixes, explained on a call.
A retest after fixes
Is a retest included, and do you get written confirmation?
UnFoldMart: Free retest and a retest letter.
Honest about compliance
A tester is not an auditor. Be wary of anyone promising a certificate.
UnFoldMart: Readiness support for SOC 2 and PCI DSS; we never certify.
Careful with your data
How test data, credentials and the report are handled.
UnFoldMart: Only the data the scope needs.
Black box, grey box or white box?
| Grey box | Black box | White box | |
|---|---|---|---|
| Access for testers | Test accounts and some documentation | No inside knowledge | Full access to code and design |
| Simulates | A user or partner with an account | An outside attacker | A deep review with insider knowledge |
| Coverage | Good balance; the usual choice | Lower; time goes into discovery | Highest |
| Best for | Most web apps and APIs | Checking what is exposed to the internet | Critical systems and code-level review |
What affects the cost
No price list. Your quote depends on these factors.
- Systems in scopeApps, APIs, networks.
- Testing depthBlack, grey or white box.
- Manual testingHow much of it.
- Compliance evidenceWhat you need to show.
- DeadlineYour audit or launch date.
- Regulated environmentsFCA-regulated firms often need more documentation.
Ways to work with us
Fixed-scope test or assessment
Scope and price in writing.
Programme support
A readiness plan, step by step.
Retest included
Free, after your fixes.
How quoting works
- Short briefWhat to protect, and why.
- Free 30-minute callBy video, in English.
- Scope and quoteIn writing, tailored.
- You decideNo obligation.
UK rules for security
This is general information, not legal advice. Your legal adviser has the final word.
Cyber Essentials
A UK government-backed scheme run by the National Cyber Security Centre that covers five basic technical controls. Certificates are issued by NCSC-licensed certification bodies; we help you prepare, we don't certify.
Official source: Cyber Essentials (ncsc.gov.uk) ↗UK GDPR breach reporting
Organisations must report a personal data breach to the ICO within 72 hours of becoming aware of it, unless it is unlikely to put people's rights at risk.
Official source: Report a breach (ico.org.uk) ↗Computer Misuse Act 1990
Accessing a computer system without authorisation is a criminal offence in the UK. That is why every test we run starts with written authorisation from the system owner.
Official source: Computer Misuse Act 1990 (legislation.gov.uk) ↗Public standards and rules we align our work to
Working with us from London
One dedicated team; projects are led by UnFoldMart from our international offices.
Our London office
32 London Bridge St, SE1 9SG London
By video
Scoping, walkthroughs and check-ins by video.
Language
Calls and reports in English.
Time zone: UK time (GMT/BST)
Office-hours overlap: –
09:00–18:00 local time in both offices.
Company-wide figures across all our services, not security projects.
- Zürich · in person
- Frankfurt · in person
- London
- Amsterdam
- Paris
- Madrid
- Warsaw
- Singapore
- Vancouver
- Gurugram
Frequently asked questions
Cyber security in London: before you book a call.
Do you have an office in London?
Yes. UnFoldMart's London office is at 32 London Bridge St, SE1 9SG London. Meetings with London clients are by video, in English.
How much does a penetration test cost in London?
We don't publish prices. Cost depends on the systems in scope, testing depth, how much manual testing is needed, the compliance evidence you need and your deadline. After a short brief or a free 30-minute call, you get a written scope and a tailored quote.
How long does a penetration test take?
Typically: scope and sign-off about a week, testing 1 to 4 weeks depending on scope, and the report within a week after testing, explained on a call. The free retest runs when your fixes are ready. These are ranges, not guarantees.
Black box, grey box or white box?
Black box: no inside knowledge, like an outsider. Grey box: test accounts and some documentation, the usual choice. White box: full access to code and design, for the deepest review.
Can you get us SOC 2, PCI DSS or ISO 27001 certified?
No. We are not an auditor or certification body. We offer readiness support: a gap review, help putting controls and evidence in place, and help answering customer security questionnaires.
Is a retest included?
Yes. After you fix the findings, we retest them for free and give you a retest letter that shows what is closed.
Do you need written permission before testing?
Yes, always. Testing starts only after the owner of the systems signs the scope, the testing window and the rules. If a system is hosted or run by someone else, their rules apply too.
Can you help us get Cyber Essentials?
We help you prepare: we check the five controls, help close the gaps and get your answers ready. The certificate itself comes from an NCSC-licensed certification body, not from us.
A customer wants a recent penetration test and a security questionnaire. Can you help?
Yes. We test the systems your customer cares about, give you a report with severity and fixes, retest for free after your fixes, and help you answer the security questionnaire.
Who works on our project, and how do we communicate?
Projects are led by UnFoldMart from our international offices, with a small dedicated team. Calls are by video. Calls and reports are in English, and critical issues are flagged at once.
Need a penetration test in London?
Tell us what to protect and by when. A clear scope and tailored quote follow.