Delgada was launched 20 February 1943 by the Seattle-Tacoma Shipbuilding Corporation, Seattle, Washington; sponsored by Mrs. James B. Sykes and reclassified CVE-40 on 15 July 1943. She was transferred to the United Kingdom under Lend-Lease on 20 November 1943, and served as HMS Speaker. After the loading of equipment, familiarisation by the Royal Navy sailing crew and a day's steaming trials, Speaker was accepted. She was formally commissioned on 20 November 1943, when the White Ensign was hoisted at a ceremony attended by the builders and the U.S. Naval authorities, and by 6 December she was ready to sail. . As delivered, these carriers required modifications to conform to British standards and the initial works were done at Burrards at Vancouver, British Columbia, Canada. These included extending the flight deck, fitting redesigned Rying controls and fighter direction layout, modifications to hangar, accommodation and store rooms, extra safety measures, oiling at sea arrangements, gunnery and other internal communications, extra wireless and radio facilities, ship black-out arrangements and other necessary items. After working up off Vancouver, a passage through the Panama Canal on 8 March 1944, further works at Norfolk, Virginia and loading crated aircraft, stores and passengers at Staten Island, New York, Speaker sailed for Liverpool on 8 March. She sailed with an eastbound convoy and arrived on 8 April. She returned to the U.S. to perform a second aircraft ferry run. On 17 May, she was at Greenock awaiting orders. Now required to be an assault aircraft carrier, supporting army operations, she underwent further modifications at the Caledon Shipbuilding & Engineering Company, Dundee. While waiting for her squadron of Hellcats to complete their training, Speaker filled in as a training carrier from 16 October to 14 December. Nearly 1,500 landings were made by Fairey Barracuda, Fairey Swordfish and Curtiss Helldiver aircraft.
In late December, Squadron 1840 embarked with new rocket-fitted, Mk. III Hellcats. Speaker sailed from the Clyde for Gibraltar and the Mediterranean on 11 January 1945, in company with, and three destroyers. While passing through the Mediterranean, the flotilla flew an anti-submarine search off North Africa after a reported sighting by a merchantman, but without success. The flotilla continued on to join the Eastern Fleet at Colombo, Ceylon. They paused briefly at Alexandria and refuelled at Aden. Flying practice continued en route, one aircraft and pilot being lost in an accident in the Red Sea. At Colombo, where they arrived on 4 February, Speaker and Slinger were ordered onward to join the British Pacific Fleet at Sydney, Australia. While off Western Australia, the two carriers assisted in a search for survivors of a troopship sinking. They arrived at Sydney on 23 February. Eight of Speaker's aircraft and pilots were transferred to. While in port, repairs and maintenance were completed and crew enjoyed shore leave in local homes.
British Pacific Fleet
Speaker left Sydney on 9 March for the BPF forward base at Manus Island, via the Jomard Passage, where she joined the search for survivors of. After a short and bleak stay, and now part of 30th Aircraft Carrier Squadron, they sailed on 18 March with Striker and an escort led by. Their role was to provide air cover for the British fuelling area during Operation Iceberg. The escort for the "logistic" force were British and Australian destroyers, sloops, frigates and corvettes. Despite the routine nature of the duty and the lack of combat action, the morale of the logistic force and its escorts remained high. On 23 May, the BPF retired to Leyte, for replenishment and Speakers remaining pilots and aircraft, and some maintenance personnel, were transferred to Indomitable to boost front-line strength. Speaker was transferred to be a replenishment carrier, with a supply of replacement aircraft for the fleet's operational losses and receiving "flyable duds" for repair and injured crew for treatment on the hospital ship Oxfordshire. Operation Iceberg completed in mid-May and the BPF returned to Sydney for repairs, storing and shore leave for the crews. En route, Speaker took a sick Australian soldier off an American troopship for emergency surgery.
Post-war
HMS Speaker was returned to the United States on 27 July 1946 having arrived at Norfolk Navy Yard on 20 July. The flight deck was removed and was sold into merchant service 22 April 1947 as Lancero. The ship was sold for scrap in Taiwan in 1972.