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, Europe, US 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, ISO 27001 lead auditors 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.

Every certification independently verified, not self-claimed. PCI SSC-listed at company level. UKAS-accredited ISO 27001 and ISO 9001. NCSC-aligned Cyber Essentials and Cyber Essentials Plus.

  • PCI DSS QSAC

    PCI DSS QSAC

    PCI SSC-listed

  • ISO 27001

    ISO 27001

    UKAS-accredited

  • ISO 9001

    ISO 9001

    UKAS-accredited

  • 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 fixed-fee options before work begins.

Senior consultant reviewing compliance documentation