Canary Wharf financial district at night — 1 Sequence Cyber engages merchants, acquirers and enterprises across global finance
UK QSAC · ISO 27001

UK-credentialled cybersecurity consultancy.Globally engaged.

PCI DSS, Penetration Testing, ISO 27001, SOC, vCISO — and the rest of the compliance and security stack.

Engaged by merchants, acquirers, and enterprises across the UK, USA and APAC to deliver audits, harden defences, and sustain compliance.

Independently verified
  • PCI SSC-listed QSAC
  • ISO 27001 & ISO 9001
  • Cyber Essentials Plus
Why us

We deliver every engagement directly.

  • Independent

    We do not resell platforms or sit downstream of vendor incentives. Our advice is for the buyer, not the supplier.

  • Practitioner-led

    Engagements are delivered by QSAs, lead penetration testers and senior security practitioners — not generic account teams. UK-incorporated (16021460). Headquartered in Milton Keynes.

  • Multi-discipline

    PCI DSS, offensive security, ISO, privacy, GRC and vCISO expertise sit under one roof, giving clients joined-up assurance instead of fragmented advice.

24×7 Operations

Security operations, on call.

24×7 Security Operations Centre delivered as SOC365 Services. 4-hour IR response on retainer.

See SOC capabilities

Audit-defensible credentials.

PCI SSC Qualified Security Assessor (QSA) company · ISO 27001 & ISO 9001 certified by a UKAS-accredited certification body · IASME-licensed Cyber Essentials certification body

  • PCI DSS QSAC

    PCI DSS QSAC

    PCI SSC-listed

  • ISO 27001

    ISO 27001

    Certified by a UKAS-accredited certification body

  • ISO 9001

    ISO 9001

    Certified by a UKAS-accredited certification body

  • Cyber Essentials

    Cyber Essentials

    IASME-certified

  • Cyber Essentials Plus

    Cyber Essentials Plus

    Independently audited

Ready to scope an engagement?

Speak directly with a senior practitioner. We’ll confirm scope, evidence requirements, timelines and pricing before work begins.

Senior consultant reviewing compliance documentation