Anchored to UK statute. Last verified 21 June 2026. View source-of-record.

maduediligencechecklist.co.uk

The UK M&A Due Diligence Checklist

Schedule

VIII

IT and cyber


Infrastructure, application inventory, cyber posture, security incidents.


  • VIII.1
    Obtain application inventory with licence type, user count and renewal date.
    Severity B
  • VIII.2
    Identify any SaaS or licensing true-up exposure.
    Severity B
  • VIII.3
    Review infrastructure topology: cloud accounts, on-prem, hybrid.
    Severity B
  • VIII.4
    Confirm Cyber Essentials Plus or ISO 27001 certification status.[NCSC CE]
    Severity B
  • VIII.5
    Obtain most recent penetration-test report and remediation evidence.
    Severity A
  • VIII.6
    Review security-incident log for the last three years and ICO notifications.
    Severity A
  • VIII.7
    Confirm backup, BCP and DR test history.
    Severity B
  • VIII.8
    Test password, MFA and privileged-access controls on a sample.
    Severity B
  • VIII.9
    Review identity / SSO architecture and joiner-mover-leaver cadence.
    Severity B
  • VIII.10
    Confirm cyber-insurance cover and any exclusion for prior incidents.
    Severity B
  • VIII.11
    Identify open-source software dependencies and any GPL-style licensing risk.
    Severity B
  • VIII.12
    Confirm software-development lifecycle: code review, SCA, SAST, DAST.
    Severity C
  • VIII.13
    Review hosting locations and data-residency commitments.
    Severity B
  • VIII.14
    Obtain SOC 2 Type II report (or evidence in-scope alternative).
    Severity B
  • VIII.15
    Confirm vendor-risk-management process for third-party services.
    Severity C
  • VIII.16
    Identify any pending IT-modernisation capex in the forecast.
    Severity C
  • VIII.17
    Confirm shadow-IT discovery and any unmanaged sanctioned tools.
    Severity C
  • VIII.18
    Review historic security incidents impacting customers and notifications.
    Severity A

Reviewed by Oliver Wakefield-Smith, Founder, Digital SignetLast verified 21 June 2026Schedule VIII

This page is anchored to UK primary legislation and named regulator guidance only. Not legal advice. Confirm position with your appointed adviser before signing.