Penny,

A lamington pan is a couple of inches deep, that's all - neither shallow like a tray or deep like a roasting pan. The sides need to be straight, at right angles, and not curved to make it easier to get the cake out of the pan. You could use a roasting pan but just make the cake a couple of inches high and cut the edges off to make them straight.

Lamingtons are just vanilla cake cut into rectangles about 2 inches by 3 inches, and then dipped in runny chocolate icing and rolled in dessicated (finely shredded) coconut. The cake needs to be a butter cake or something like that which is strong enough to withstand some personhandling (that's manhandling for any non-PC 'Cats reading this).

Is copha hard to get in the UK? It's solidified coconut oil, I think, and probably really bad for the heart. The main Oz recipe using copha is called Chocolate Crackles. You mix cocoa powder & sugar with melted copha and while it is still runny mix in lots of rice bubbles and then spoon portions into patty-cake papers to make individual servings. Put them in the frig to set. Very popular at kids parties.

Helen