Risk control clauses are often used in insurance contracts with a view to preventing the assured from altering the risk during the currency of the policy. An insurance warranty is the most commonly used risk prevention clause in practice. Having been subjected to severe criticisms for years, the legal regime concerning insurance warranties and other risk control clauses has recently been revamped by the Insurance Act 2015, which will apply to all contracts of insurance concluded after 12 August 2016. This article intends to elaborate on the appropriateness of the reforms introduced by the 2015 Act from risk assessment and management perspectives. It is also intended to offer a critical analysis on the potential impact of the changes on insurance law and practice.