And here are the GDPs (nominal and PPP) per capita for the Five Eyes:
As you can see, Australia, Canada, and New Zealand all do better under nominal than GDP, as they all have higher costs of living + more resource-based currencies, which put upward pressure on currency value.
Only the U.K. does better under PPP, due to its lower CoL.
Which is all to say, the numbers presented in this chart are actually the most generous to Australia, Canada, and New Zealand. They would fare worse under the other measure. The London numbers, meanwhile, are slightly lower than they'd be under PPP.