A really puzzling bird and I wish there were more images. It looks at first glance like an Acro with that heavy bill, rather broad tail with slightly pointed tips and even an apparent contrasting pale iris. However, on closer examination, the undertail coverts don't look particularly long or full and the wing looks more like that of an Iduna with those tatty-looking tertials of uneven width and ragged edges to the secondaries. BRW in particular has a sleek look with very even, neat-looking rows on the wing and it's hard to imagine one looking as ragged as this. The apparent lack of emargination is puzzling - emarginated P3, 4 & 5 would be a feature of all Iduna species as well as BRW, wouldn't it?
Certainly not Basra - that's the only thing I'm sure about!