Russell Crowe reportedly walked out of an interview on the radio arts programme Front Row when the interviewer suggested he could hear hints of an Irish accent in Crowe's portrayal of Robin Hood in a new film (story here). Crowe played the folk hero with a Yorkshire accent (we always associate Robin Hood with Nottingham, south of Yorkshire in the English Midlands, but Hood might have been from further north, apparently). For this he had special dialect training.
This morning's Today programme interviewed the dialect coach Andrew Jack, who attempted to teach Evan Davis, one of Today's regular presenters how to say the sentence "The laws of this land enslave people to its king. A king who demands loyalty but offers nothing in return" from the Robin Hood film, first in a Yorkshire accent, and then in an Australian accent. When teaching actors an accent coaches have 'key words'. Once an actor can manage the vowel sound in that word, they shouldn't have trouble with other words which contain the same sound. So, must is used as a pattern for other words -- just, but, cup etc, and ought as a pattern for the vowel sound in daughter, caught and Yorkshire. You can hear the piece and upload your own attempt at a Robin Hood accent here.