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CX appears to have a distance based chart....SYD-HKG-LHR is over 10,000 miles however you calculate it (I think CX adds the two segment distances together but in this case that seems virtually identical to the direct)
If the chart that popped up when I googled "Cathay Award chart" (hint hint) is still current it is 110,000 one way/175,00 return for a Standard Award.....(Zone F 10,001+)