Australia is in summer, so it would make more sense to compare it to the UK’s summer, if you insist on comparing two countries with very different population densities (a key factor in the spread of COVID-19).
I'd say that counts against the UK: The UK failed to control this DESPITE lovely weather meaning people don't mind meeting outside and schools being shut anyway. Australia battled this through their winter and won despite the outdoors being basicly shut...
Population densities are not wildly different between the two countries if you realise that most of Australia is effectively unpopulated and the vast majority live in a handful of metropolitan areas.
Australia is in summer, so it would make more sense to compare it to the UK’s summer, if you insist on comparing two countries with very different population densities (a key factor in the spread of COVID-19).