I had a good long read of the new rules when they came out a few years ago, and the 2 main points I was able to decipher out of it all were:-
1. Although you need to be established at 5 miles on final, you are not required to make a call AND you do not have right of way.
2. At 3 miles you are required to make a call, you are considered to be in the circuit, AND you now have right of way.