Foreword, 25 Years of TAGS1 and LWRSG, Materials Factors and Structural Integrity of Reactor Components, The Micro-Mechanisms of Fracture in Steels Used for High Integrity Structural Components, Welds, Their Quality and Inspection Ability for High Integrity Structures and Components, Material Conditions that Lead to Crack Arrest, Fracture Toughness - a Measurable Materials Parameter, Micro structural Development in RPV Steels, Local Approach Modelling of Constraint Contributions to The Ductile to Brittle Transition, Loading Rate Effects on Tensile Properties and Fracture Toughness of Steel, Material Factors which Influence Remaining Life of Components Subject to Reheat Cracking, A Historical Perspective of Materials Related Structural Integrity Issues in the Nuclear Industry