Air Ceylon was founded by their Government in 1947 and its connection with the Comet was that the airline, in 1962, leased a Comet 4 from BOAC so as to provide once weekly services between London and Singapore.
The aircraft concerned was ex-BOAC G-APDP. Later another BOAC Comet G-APDS leased to the airline for a few months during 1965.
Additional Information: from Bart Koop
Air Ceylon has also flown G-APDC, in each case in 1963. My father was a passenger on a flight from Ceylon to Singapore that year and shot some photos.