Cheers guys,
mos - yeh that's the only real piece I could find referring to it as "melodic major".
meganutt - thank you yes that makes sense. Not sure if it's just me, but I have a habit of referring to each scale independent of its modal function. e.g. the "Spanish scale" is a mode of harmonic minor (known as Phrygian dominant), but it is also a scale in its own right if you see what I mean. To me it defines its function more clearly. In other words, I don't see "melodic major" (if like you say it can justifiably be called that) as necessarily being used as part of a larger modal function, but often just as an alternative for the tonic I chord.