Thanks to excellent source materials from smurf I have rejigged the whole thread and drawn some interesting precursors to the Surreys and redrawn the Surreys too. Full info on p.1.
5-Turret County (2 layouts) 1927
Design X - early version 1927
Design X 1927
Design Y 1927
Design Y - later design with straight funnels and masts 1928