smaller version of the County classes, but with better protection. Much improved armour protection over machinery spaces in this class was probably the vital element that saved Exeter at the Battle of the River Plate. A main armament of three twin 8-inch turrets instead of four permitted a reduction in length of 50ft and in weight of about 17 per cent compared with the Kents. Exeter had straight masts and funnels. Exeter's bridge structure was of the "box" type (next seen in the Leander-class light cruisers).

Exeter's single 4" AA guns were replaced by twin mounts during her refit following the Battle of the River Plate. Also 2 8-barrelled 2pdr's were fitted.