Oxbridge > NUS/SMU/LSE > UCL > Melbourne/Sydney > Kings > tier 2 UK > rest of Australia/NZ

Those who can make it into NUS/SMU can definitely get into UCL. Typically, employers do not differentiate between NUS/SMU. Both are seen as equal.

Melbourne's curriculum is more rigorous than Kings, just compare the number of FCH. I would put Sydney over Kings too tbh.