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In 1941 at the young age of 19 he started at Bletchley Park as an intercept operator. The bay he worked in contained two HRO receivers, each operator being given a specific list of signals to listen for. In April 1943 he was transferred to Section VIII unit, and served at Weald Station as a two-way radio operator, under Morse code expert Captain Robert Henry \"Harry\" Tricker. In 1944 Pat joined unit SCU9 and was sent Into war zones where covert communications were required . After the D-Day Allied invasion of Europe in June, with the small mobile unit headed to Normandy under the direction of Tricker who was now a Major, Pat went to Normandy, where he remained until August. 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