Various activities onboard HMS Theseus (a Colossus Class aircraft carrier).
I. On the flight deck of HMS Theseus, a talker and teller are in position. A ship's bugler plays through the ship's Tannoy. A bugler (full blues) plays on deck. A Lieutenant Commander (seen in long shot and close-up) is on the bridge. Various shots of handling party emerging from the lift. A flag is hoisted by two ratings. Close-up of 216 pom-pom, 40mm gun. 4-barrelled pom-pom being cleaned (half-heartedly) by two ratings.
II. Various aerial shots of a Colossus Class aircraft carrier at sea Theseus? followed by the minelayer HMS Manxman.
III. Fireflies and Sea Furies fly in formation over HMS Theseus.