"Euryalus" was the last original "Dido" operational in Royal Navy, until 1954, mainly on the South Atlantic station. The ship was the most modernised of the original "Dido"s, having been extensively updated from October 1943 to June 1944 at John Brown on the Clyde with new light anti-aircraft armament of 20 mm, 40 mm and 2-pounder mountings and a generally new radar suite with Type 293 radar the standard post war Royal Navy target indicator and close range air and surface search, Type 272 heightfinders and surface warning and new navigation radar. After the end of World War II "Euryalus" spent 18 further months in the Pacific Fleet operating from Sydney, Japan and Hong Kong before returning to the UK for a year-long modernisation at Rosyth in 1947–48. By this time the long range airwarning radar on "Euryalus" was the late war Type 279b/281, the precursor of the post-1945, Type 960. Photos reveal that "Euryalus"s turrets were also modified externally in the same way as s and s with the insertion in the turret for operators of a large Perspex sighting windows. In the early 1950s a major modernisation was planned for "Dido"-class cruisers "Phoebe", "Diadem" and "Cleopatra", refitting them in a similar pattern to HMS "Royalist" with the further improvement of new boilers, similar to those of the . The $4.5 /million cost of "Royalist"s update to a 1950s carrier fleet picket standard ruled this out.