A renowned BBC world wide broadcaster for the people outside UK is not understanable due to the UK slang ?

In breakfast news on UK GOVT.`s, BBC very often we observe that, the Moderators, speach is unable to understand outside UK, due to the fact that the slangs used by Moderators, is ideal for within UK but not for the viewers outside UK, that too non Europeans? Besides some of them speak at the Speed of an EXPRESS Trains, thus defeating as an World wide Broadcasters? In addition the Names of the Moderators are shown for less than few seconds so unable to trace which Moderator? and what has He/She said ? Besides there is no exchange of wordings & Debates from viewers,listners out side UK to clear all these doubts.