Whilst the ONR has recently adapted the GDA to be more suitable for small modular reactor (SMR) technologies, to date no SMR design has completed the entire three step process. The ONR should reflect, both during and after the first SMR has completed the GDA, on the lessons to be learned on efficiency and applying appropriate safety cases for these smaller technologies, from other similar bodies, such as the Environment Agency and Health and Safety Executive that regulate Fusion energy facilities.