, the first to be completed, was commissioned in 1954. The ship had an axial flight deck and was thus unsuitable for operating the jets then rapidly supplanting piston engine aircraft in the Fleet Air Arm. "Centaur" was commissioned in Belfast and after completing her sea trials, she then steamed into Portsmouth Dockyard and for the next six months in 1954 the ship underwent a substantial reconstruction to provide for an interim (angled at 4 degrees, and not sponsoned out) angled flight deck and low powered steam catapults. However, service in this new configuration did not last long and the ship was decommissioned in 1965, but used as a harbour accommodation ship for a further six years. Conversion to a "commando carrier" configuration was cancelled in 1966.