Australian and British Food Questions

I'm thinking of trying my hand at Lamingtons this week... however, the recipes I have all make HUGE amounts (estimated 24). Does anyone know if Lamingtons will freeze well for later? And how long do they generally keep after they're made? Anyone have a favorite recipe for them? I may look at doing a half batch, which shouldn't be too hard -- it just means making a smaller pan of sponge cake and not preparing as much of the icing.

The other question is about Mushy Peas. I've liked the stuff when I've had it, and I picked up a can recently to try on my own... but have no clue how to prepare it. Do you just heat it up? Anyone have any good recipes for Mushy Peas?