You must have been living under a rock to think Sydney is more British, is way more American than British. Sydney has a big surfing culture just like the U.S which Britain does not have.
Lots people drive American style Pickups and Utes everywhere here. The Ford Ranger Pickup is the one of the top selling vehicles here. British don't drive them.
Fashion, Aussies dress almost the same as Americans. LA and NY baseball caps are worn everywhere along with all the college style and street style of the U.S.
Houses and streets of all the newer suburbs are just like the U.S.
Then look at the NRL, even though it's a British sport. We have cheerleaders and team mascots just like the U.S. The whole presentation of the sport in influenced from the NFL
Even our cops are all armed just like the U.S. British cops don't even carry.