Originally Posted by DeSica
Rock Hudson once shared his secret for his deep, sonorous voice on some biography I saw on television.
He said a fellow actor told him to go out to the hills in California when he had a sore throat, and to shout till he was raw.
Apparently, this damages the vocal chords, and when they heal, the voice is lowered a bit. Hudson says he did this, but it seems pretty obvious that he had an unusually low voice to begin with.
As for the accent, you could try a coach, or just try and copy it on your own. If you're surrounded by Brits, you should be able to slide into their accent to a degree. I happen to have an ear for languages, and speak a few to various degrees, so picking up accents has always been easy for me. If it doesn't come easy for you, try going for that "Frasier Crane" sound. American, but very proper.
If you find yourself saying 'bruvah' and 'muvah,' then you're copying the wrong people. Watch the movie "Sexy Beast" for how not to speak.
To get the way Frasier Crane speaks, or perhaps the perfect archetype, Orson Wells, you're talking about a study of diction for quite some time in the theater... again, you'll probably sound like a poser.