May I suggest that if you have not done it already you read the FAQ and Prices stickies?

As pointed out above, the OP needs to make some significant changes to the routing to make it work.

EDI-LHR-DEL-HKG-BJS//HKG-BKK-HKG-JFK-LIM-EZE-SCL-USH-SCL-JFK-MAD-TLV-LHR-EDI

Should be ok I think, 41000miles. You could go to ATH instead of TLV ofcourse. You can throw in a couple of segments in NA if you want to maximize miles (although you will have to pay taxes and fuel), for example throw in JFK-SFO-DFW-JFK, but I have little knowledge about NA and maximizing miles there.

You will have to buy BKK-SGN-PNH-BKK separately, PNH-BKK is flown by AirAsia. How to get to SGN, I don't know, try Vietnam Airlines (their homepage is under reconstruction).