Phil
If you contact Wolfgang H Bandisch who lives in Port Moresby He was in charge of the botanical gardens in PNG and he is keen orchid grower. He is on Facebook.
He is very helpful
I think you will find this is a Bulbophyllum. It should not be that difficult to identify given the dramatic coloration. It is not a Coelogyne or Eria based on the position of the inflorescence.
OK - have now uploaded a picture of the whole plant. It doesn't look similar to other Eria or Coelogyne I have - so I guess Bulbophyllum is more likely. Any more clues? I know Bulbophyllum is a huge genus.