[dvboy]

On the point about context to news for World viewers: good point, however to an extent the reverse it also true - British viewers will be irritated by constant explanations of where Warwickshire is and how the “UK Finance Minister” is called the Chancellor, so will quickly switch away if things get too international.

It is possible to write a script that subtly explains what someone's role is without being too obvious about it.

Take for example the HS2 story. It can be introduced it as being a line linking "parts of England" or "North West England with Birmingham". You don't then later need to introduce Mark Harper as specifically the UK's transport secretary as the context is already there.