Thanks for all the advise.

I'm sorry I wasn't clearer before.

I did purchase from BA and not an agent. I was hoping to use my BA miles to upgrade not pay the difference. The BA RTW agent said that none of the RTW fares could be upgraded with miles. I just found this strange.

CX is my next try. They just want a LOT more miles than BA for a 5500 mile journey. I'm a bit worried though because it's BA ticketed and not CX. I'll give it a try though.