Darren,
and you sure have some lovely plumeria there.
We have a forum just for Plumeria here at ATP. The real experts all hang out over there. I'd suggest you post this and add pictures of the whole plant and leaf detail as well as what the scent is like. All those details can help a lot with ID.
I only have a couple, but they identified one of mine last year by the hooked tips of the leaves, and the fact that it has a gentle, almond scent.
