As of 1st April 2025, the Security Industry Authority (SIA) has instructed that all door supervisors and security guards must complete mandatory refresher training if they want to renew their licences. Why? The SIA refresher training course will ensure that all security professionals remain up-to-date with the latest industry standards and practices. Here, the experts at Stonewall Security take a closer look at the SIA refresher training course so you know what to expect.