Apparently modern mass media (broadcasting) has so corrupted speech patterns in old Blighty that TV and filmmakers are no longer able to find teen actors capable of good diction. In fact, they're blaming Australian TV soaps for their plight.
I would have thought on that basis we'd all be speaking American down here, but it appears not.
Still, it does raise fascinating questions about speech patterns and accents. After all, is the American accent really just a reflection of how the Brits used to speak at the time of Colonisation? Are the NZ and Aussie accents reflective of how much the British accent had changed by the time settlers made it downunder?