* - Flotilla leaders

With the Mk.4 director and RPC, one bank of tubes was removed. Here, Cossack carries two pom-poms in place of the 20mm AA abaft the funnel. © Andrew Arthur.

Repeats of the "Z" and "Ca-" classes, these ships carried the Mk.VI LA/HA.DCT controlling remote 4.5" guns which followed it in elevation and training. Due to the increases in topweight, 1 set of tubes had to be removed to increase stablility, and even then they were extremely top-heavy, due to adhering to the "S" class hullform and incorporating more advanced, thus heavier, technologies.
All this increased topweight meant two of the designed twin 20mm AA guns were replaced with singles, and then to replace the single ones abeam of the funnel with single 2pdr pom-poms.
Because of supply delays with the Mk.VI LA/HA.DCT, none of the class were delivered before VE-day, and as such, the light AA armament was changed in those vessels less advanced, and later in the more advanced vessels; the pom-poms were replaced by 40mm Bofors AA, and directing radar was fitted on the twin Bofors AA.
This class was a poor example of weight and balance, but they offered huge advances in directed AA and anti-surface fire, which fairly offset the topweight problems.