I have also done that. For years and years, the only television I watched was British television over the internet... and I gained a sincere admiration for that society's brand of intellectualism. I was always thinking I might go there, someday to live. I found then that practicing a pseudo British accent made it much easier for me to talk, fluently. The only problem, is that my voice has taken on an affect over the years since that point, where I have this "high rising terminus" to my phrases and it doesn't match with the American expectation of the male baritone "chocolate voice." That, itself has created has created a mild social impediment. But now I'm living overseas, and I find foreigners much more forgiving of this higher and more melodic tone of voice. In fact, I probably could fit in really easily in Canada.