There were 4 Cambrian Class light cruisers but Cambrian was the last to complete (at Pembroke Dock) and had a 6" gun forward instead of the sided 4". Navis has modelled Castor with the sided guns. She completed in 1915 and was modified in 1916 to the same configuration as Cambrian. All members of the class had the 4" replaced by a fourth 6" abaft the funnels in 1917-18 and were scrapped before WW2. Castor was flagship of 11th Destroyer Flotilla and was damaged at Jutland. Constance & Canterbury were at Jutland too and this model would represent these other two ships.