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By appearance Ian I would say Ophion luteus is correct. I only wanted to prove existence in Indonesia but no luck with a quick search.
Thanks Johan Heyns, Ashish Nimkar, JuanDiTrani, Argy Bee, Jolly Ibañez.
Should I name it Yellow Ophion (Ophion luteus) is a species of Ichneumon Wasp?
In the spotting below are three links to similar spottings.
http://www.projectnoah.org/spottings/144...
This looks very much like Ophion luteus.. which is common around Britain !!! http://www.flickr.com/photos/plymmer/775... and here http://en.wikipedia.org/wiki/File:IC_Ich...