Very nice find, Lazy8….It overlaps a little with some recent reading of mine about 232 Squadron operations from Ceylon in 1945/1946 (Liberator, Skymaster transports.) They used service codes LA (Liberator) for Delhi-Ceylon (daily each way), LY (Liberator) ( Ceylon-Cocos Isl. (weekly each way), LV (Liberator) Ceylon-Cocos Isl.-Guildford, Australia (twice weekly each way), LZ (Skymaster) Ceylon-Cocos Isl. -Guildford-Sydney, Australia (thrice weekly each way). These seem to be service codes rather than route codes like UC and U.I.C, though. Perhaps a route information book was produced for the Ceylon to Australia service…that would be a find!