The speech used by BBC broadcasters comes close to a standardized, common currency speech.
We get the complete BBC News Channel, by cable, and enjoy not only the news and business, but the many special programs that they present throughout the day. The language is good, 'clean' English, spoken with good diction; if they say pahs-ta, it is still understandable to those who say pas-ta.
Of course, the sports section causes head-scratching when the subject is kricket.

At the opposite end is "Eastenders," seen sometimes on television here.
And I can never remember if the slang expression 'half six' is 5:30 or 6:30.