CBEST evaluates how well firms and financial market infrastructures (FMIs) can withstand cyber attacks by simulating real-life scenarios that hackers may use. This report, which contains valuable advice and insights on cyber resilience from the National Cyber Security Centre (NCSC), is now being published in its entirety for the first time. It emphasizes the importance of building robust cyber hygiene practices and encourages firms to conduct various cyber testing scenarios to remain strong against threats.