Obviously, the news department has higher pronunciation standards than does the entertainment division. I have a great deal of experience with this as I have British family which I visit almost yearly. We often have a hard time understanding one another. If it is not the pronunciation, it's the terminology. Several months ago, in London, I mentioned to the family that my grandson was going to enter college this Fall.
Pronunciation is another barrier to our cross-Atlantic relationship.
Particularly when cousin Simon's friend Adam is around. He speaks much like Eliza Doolittle did when Prof. Higgins first found her in Covent Garden. I'd do better with Adam if he wrote down on paper what he was trying to say. But, I digress. BBC America needs to do America, and itself, a favor if it hopes to be successful here.