Welsh is far from unique in that regard. Think of English and compare Scouse with Geordie, or Glaswegian with Bristolian. The solution, in English, is Received Pronunciation, sometimes referred to as "BBC" English. That sort of differentiation does exist in Welsh, i.e. speaking the language in its correct grammatical idiom. Lle and Ble, for instance, are contractions of Ym mha le . . . The example of 'dockavor' just sounds lazy: ta for thank you might be the equivalent. The announcements made by Arriva at present are very clear, contain neither slang nor dialect and have little trace of a particular accent.
