The big issue, apart from the confusing box and sprue names, was the box only containing thirty two shields to go with forty figures. Fortunately, Dave at Warlord Games replied to me saying that this box should have also contained eight metal shields in addition to all the plastic sprues.
After a bit of poking around the internet (some of it wargaming related,) I've also been able to confirm that all three of Warlord Hoplite boxes (Ancient, Classical and Spartan) have the same main sprue, with the specific themed components coming on a smaller custom sprue.
So now I've cleared that up, I think I'll order a box of Spartan Hoplites and a pack of metal Hoplites. With that mix of figures, I should be able to make two units of Hoplites in linen armour, one large unit of levy Hoplites in tunics and one unit of Spartans in bronze armour.
The only thing left to do is start painting. . . .