I see you can fly one-way with IR from LHR to THR for about £320 + tax. This is rather expensive, but at least a little cheaper than a return ticket. Would it be aboard a 741 or a 742? I guess the 74L is not likely.
You can fly interally within Iran for very little indeed (and on 727, A300, 707 (if lucky), etc.), and fly to DXB from THR on a T20 for under £90 one-way all-in.
What about be the best way to fly on a 74L? Previously, I could have flown LHR-DAM on the 74L, DAM-THR on the 741/2 (it used to operate, but now the A300 operates it ) and then THR-elsewhere/
You can fly one-way all-in routing DXB-CMB-KUL-SIN-CGK on UL and EK for about £175. Not bad.
[Edited 2006-02-22 22:17:23]