Independent, third-party review of fire engineering design is a critical process for ensuring life safety and legal compliance in the built environment. In the wake of the Building Safety Act 2022 (BSA), the scrutiny applied to fire strategies has intensified, particularly for higher-risk buildings (HRBs). A peer review provides a crucial, impartial challenge to a proposed design, moving beyond a simple "tick-box" exercise to a fundamental interrogation of the engineering principles applied. It serves as a vital mechanism for the dutyholders—including the client, principal designer, and principal contractor—to demonstrate that all reasonable steps have been taken to ensure a safe and compliant building. The process validates that the fire strategy is not only compliant with the functional requirements of the Building Regulations, as outlined in Approved Document B (ADB), but is also robust, resilient, and appropriate for the building's specific use and risk profile. By engaging a competent, independent fire engineer, project teams mitigate the risk of non-compliance, costly retrospective works, and, most importantly, the potentially catastrophic consequences of a flawed fire safety design. This external validation is a cornerstone of the "golden thread" of information, providing clear justification for design decisions to the Building Safety Regulator. Ensuring Statutory & Regulatory Compliance. A third-party review provides essential assurance that a fire engineering strategy is fully compliant with the complex and evolving landscape of UK fire safety legislation. Our primary role is to verify the design against the functional requirements of B1-B5 of Schedule 1 to the Building Regulations 2010, primarily guided by Approved Document B (ADB) Volumes 1 & 2. However, where performance-based solutions are proposed using fire engineering, the review must go deeper. We scrutinise the strategy's alignment with core principles laid out in standards like BS 9999 for non-residential buildings or BS 9991 for residential properties, ensuring any deviations from prescriptive guidance are robustly justified. Crucially, the review process now operates within the stringent framework of the Building Safety Act 2022. For HRBs, the fire strategy must withstand the new Gateway review stages. Our independent assessment provides dutyholders with the confidence that the safety case report is built on solid foundations, ready for submission to the Building Safety Regulator. We also audit the design against the requirements of the Regulatory Reform (Fire Safety) Order 2005 (RRO), ensuring that the strategy is not just fit for construction but can be effectively managed and maintained throughout the building's operational life. This involves assessing whether the provisions for fire detection (BS 5839), emergency lighting, and firefighting access are practical and sustainable for the Responsible Person post-occupation. The review acts as a critical backstop, preventing non-compliant designs from progressing. Scrutiny of Technical Methodology (BS 7974). The technical rigour of a fire engineering strategy is paramount. An independent peer review places the chosen design methodologies under intense scrutiny, using the BS 7974 series, 'Application of fire safety engineering principles to the design of buildings', as the benchmark for best practice. This framework provides a structured approach to fire engineering, and our review ensures its principles have been correctly applied. Our process involves a forensic examination of the qualitative design review (QDR) to confirm that the project's scope, goals, and fire safety objectives are clearly defined and appropriate. We then delve into the quantitative analysis. If computational fluid dynamics (CFD) modelling has been used to predict smoke movement or temperature profiles, we challenge the inputs, boundary conditions, and assumptions. Are the fire size and heat release rates appropriate for the anticipated fuel load? Are the ventilation parameters realistic? Similarly, for evacuation modelling proposed under BS PD 7974-6, we assess the assumptions made about occupant behaviour, pre-movement times, and flow rates to ensure a credible and safe egress analysis. Any structural fire engineering calculations are cross-referenced against relevant Eurocodes and guidance to validate the performance of structural members under fire conditions. This deep technical dive ensures the engineering solutions are not just theoretical but are founded on sound, defensible science and established engineering principles, preventing the use of flawed or inappropriately applied models. Identifying Failure Modes & Developing Defensible Solutions. A key function of a third-party review is to act as a professional sceptic, proactively identifying potential weaknesses and failure modes within a proposed fire strategy. While the original designer may focus on demonstrating success, the reviewer must consider how