This case study details Gallagher's approach to enhancing their cyber security measures through external validation and rigorous testing. Gallagher, a leader in integrated security solutions, faced challenges in ensuring their products met high cyber security standards amidst rising threats. To address these challenges, Gallagher established an in-house security team and partnered with CyberCX for independent security audits. The collaboration aimed to validate new software features and enhance the resilience of their IT systems against cyber incidents. The outcomes included improved skills within Gallagher's security team, rigorous testing of security product lines prior to market release, and the establishment of biannual engagements with CyberCX as part of their routine product development procedures. This partnership has enabled Gallagher to maintain high standards of security for critical infrastructures, ensuring that their solutions are secure by design and effectively mitigate potential cyber threats.