According to the available evidence, while the Firearms (Amendment) Act 1997 introduced stricter controls on firearms, specific published evidence detailing the implementation of police guidance endorsing the use of checklists by enquiry officers, alongside a requirement to report anything relevant to an applicant's suitability, is not explicitly identified in the provided official sources. According to the available evidence, such operational procedures would typically be covered in Home Office guidance to police forces, and the most recent relevant legislative action was over 25 years ago.