onetrack - understood re dilemma of balance 'twixt strength and weight of tube vs. box section - makes sense. As for threepenny ice cream cones, yes - i remember them rather too well, along with tanners and coppers
I also clearly remember making my very first purchase - a Mars bar, c. 1963 and costing the princely sum of 3d... Ah, those were the days, etc...
Bug - we're all dying to know what the next step in the plan is - if there is one
TTB