Verde
Muse
In all seriousness, though, it's not just any British accent that's used when trying to portray that cultured and refined impression. It's a certain regional British accents that are used (can't remember which ones off-hand).
I don't think it is a specific region. It is more of a generic accent, often referred to as "BBC English".
I tend to speak that way myself, even though I was raised in Norfolk. If I speak in my native dialect I sound like a real dumpling.
V.

