 Complete the following phrase:  He was promoted to sub-lieutet on 5 November 1940, with seniority from 19 June. After a period of time posted to the Admiralty at the end of 1941, he was promoted to lieutet on 1 February 1942. After completing an Air Signallers course, he was posted to 700 Naval Air Squadron in July 1942 to serve aboard the battleship , flying in Supermarine Walrus reconnaissance aircraft, and taking part in 