Sorry to nitpick but the difference in area is much larger than 5 times (its about 31 times).
UK (Nthn Ireland incl.) - 243,610 km2 (Population- 62,262,000)
Australia - 7,617,930 km2 (Population- 22,861,246)
A good comparison for population as the area is much closer in size, is the 48 contiguous United States (ie. Not Alaska or Hawaii)- 7,663,941.7 km2 (Population- 306,675,006)
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