Good luck with that, because there is not such thing as a "British accent". Great Britain is composed of England, Scotland and Wales, and each of these alone has a distinctly different accent, not to mention the huge variation in accents within each country. Someone from the south of England could talk to someone from the north and have absolutely no idea what they're saying and vice versa because their accents are so ridiculously different. The accent you're referring to is Queen's English - and I can't even say that it's how people in London speak, because they don't, they do not all speak like that. I can safely say that because you want a "British accent", you should shut up." I am repinning this becuase the last persons commentary is hilarious!!!
An elderly Cherokee Native American was teaching his grandchildren about life… He said to them, “A fight is going on inside me, it is a terrible fight and it is between two wolves. One wolf is evil—he is fear, anger, envy, sorrow, regret, greed, arrogance, self-pity, guilt, resentment, inferiority, lies, false pride, competition, superiority, and ego. The other is good—he is joy, peace, love, hope, sharing, serenity, humility, kindness, benevolence, friendship, empathy, generosity, truth, compassion and faith. This same fight is going on inside you, and inside every other person, too.” They thought about it for a minute, and then one child asked his grandfather, “Which wolf will win, Grandfather?” The Elder simply replied, “The one you feed.”