Another update. The L Triple. Full details added to the first post alongside the L Twin. I've also modified the L Twin drawing as the layout of the secondaries is now much clearer (both the L plans have different top-views, what I thought was the outline of the boat deck was in fact the outline of the superstructure sides below).
Design L Triple June 1920
The L Triple, unlike the L Twin, had a light 8in armoured CT forward. Its possible the Twin had the same layout and the labels are just missing off the plan.