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Background: The interest in re‐introducing whole blood (WB) transfusion for the management of traumatic major haemorrhage is increasing. However, due to the current leucodepletion filters used in the UK a WB component was not readily available. Instead, an alternative but similar component, leucocyte depleted red cell and plasma (LD‐RCP), which provided a unique experience in assessing the feasibility of a WB component was used whilst a WB component was being manufactured. Study Design and Methods: Between November 2018 and October 2020, LD‐RCP replaced RBC as standard of care for all trauma patients with major haemorrhage in London. The aims of the study were to assess (a) deliverability, (b) component wastage and (c) safety. Results: Over the study period a total of 1208 LD‐RCP units were delivered, of which 96.5% were delivered 'On Time In Full' (OTIF). Of the 1208 units, 733 (60.68%) were transfused and 475 (39.3%) units were wasted. Component wastage reduced significantly throughout the study (p = 0.001). A total of 177 patients had a blood group recorded, 86 were group O and 91 were non‐group O. There was no statistically significantly difference between haemoglobin (p = 0.422), or bilirubin levels (p = 0.084) between group O and non‐group O patients. Discussion: It was feasible for NHS Blood and Transplant to deliver LD‐RCP on time in full, however component wastage was high due to short shelf life and limited use of the component. Low titre group O LD‐RCP units were not associated with clinical evidence of haemolysis. [ABSTRACT FROM AUTHOR]