Radioactive Waste Management (RWM) is a Nuclear Decommissioning Authority (NDA) business charged with enacting NDA strategy. A key target within RWM’s 2020/21 work programme is to develop a Sub Programme Business Case (SPBC) for the next tranche of the GDF (Geological Disposal Facility) Programme, namely Tranche 3 ‘the GDF Development Phase’ [hereafter referred to as T3]. The SPBC will be developed by RWM using several subject matter expert authors for their respective sections/content. This enquiry is for copyeditor work alongside the SPBC authors to review the whole, to ensure one RWM style flows throughout the document, highlight any areas of incongruity across the sections and correct any grammatical errors The ive of this work is to ensure the T3 SPBC is written in a cohesive, articulate and compelling voice, whilst maintaining alignment with RWM’s existing document suite in both content and style.