If you didn't make your way all the way to season 4 from the start, you shoud go back to the beginning. The series just wouldn't work if you started during season 4.
Also, the accent was Australian. :3
Mind you, this is directed at the females
Though there can be some fails with the accent, like when they are too nasaly sounding- but a soft, smooth Aussie accent on a woman.. ohhhhh...