There does not appear to be a problem with the SYD BKK flights and there are business on the BKK-LHR 30/10 TG916 or same flight 01/11...flight is 13:30 so just have to work out a flight in the connect

You will not find business redemptions on the SQ flights to LHR

The tools for checking other availability will be able to check any airlines not covered in ANA (such as LX) but looking at staralliance.com at the possible routes you should be able to find everything in ANA