Originally Posted by
Garimi
1. In new system I will need 80 Points to upgrade one way for both flights LHR-SFO and SFO-SYD?
Correct. However, you will be charged 80 points even if only one of the two segments clears.
Originally Posted by
Garimi
2. Is it posible to check if I can upgarde flights using points before buying ticket? I'm quite flexible with dates
Yes. You want to enable Expert Mode in your UA profile and, searching LHR-SFO and SFO-SYD as stand-alone segments, see if they have inventory in PZ class. Note that UA also flies LHR-LAX-SYD and LHR-IAH-SYD on some days too, as well as LHR-LAX/SFO-MEL.