I do however disagree with her advice to Charlotte. CC's voice sounds fine and most people around the world couldn't spot the difference between a Welsh and an English accent anyway. Wales is a hip place now, the home of Doctor Who and Torchwood! The US is home to The Tyra Banks Show and So you Think you can Dance?
For what it's worth my great great grandfather was Welsh. Here is a list of some Welsh people who have managed to be quite successfull without hiding their heritate. That long list of fine folks includes Dalek creator Terry Nation and of course Russell T. Davies. John Wayne is noticeably absent, even though this doctor seems to have evidence that the American legend was not in fact born in Iowa, but in Cardiff!