I'm aware now over the last 5 or 10 years that when you do an accent, you really have to kind of get down to the nitty gritty and go into the phonetics of it, if necessary. Find out not just the sounds but the rhythms and the music - or lack thereof - in a particular accent.
The anti-apartheid prisoners on the island, like so many in every age and nation, found that Shakespeare had a peculiar ability to gentle their condition. They used to gather clandestinely to read the plays; on one occasion, the book was passed around for each man to mark his favourite lines.