She was built for service as a convoy escort during the Second World War, but was completed too late to see action.

[6] The ship's main gun armament (as fitted to all the Modified Black Swans) consisted of 3 twin QF 4 inch (102 mm) Mk XVI guns, in dual purpose mounts, capable of both anti-ship and anti-aircraft use.

Post war the ship's close-in armament changed to 2 twin and 2 single Bofors guns.

[8] On commissioning Alacrity, which was assigned the pennant number U60, completed work up in home waters, before being allocated for service in the Far East with the British Pacific Fleet, sailing for the Pacific via the Mediterranean, where she carried out further training.

She was subsequently sold for scrap to W H Arnold Young at Dalmuir and arrived for breaking up there on 15 December 1956.