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Here we see a record of E. Griffin's training flights at the top secret No.3 RDF School at Prestwick in October 1942. Details of these schools remained secret for many years after the war, and I still can't find an explanation of 'SI EX DCO', although the first part may be Latin for 'wherever they are from', so 'SI EX' it may have been a semi-coded description of radar training. DCO normally stands for Duty Carried Out.
Many thanks to Ken Brewer for sending us this logbook.