Fun fact: American Southern accents are pretty easy for English actors to mimic. Because it's entirely possible that pre-American English accents were closer to modern Southern accents than to modern English accents.
Why Tom Hiddleston was the best choice to play Hank Williams in 'I Saw the Light'
Stills and behind the scenes images from I Saw the Light. (Via precurorpress.tumblr & Torrilla). Full size image: http://maryxglz.tumblr.com/post/161690113922/i-saw-the-light-2015-via-precursorpresstumblr