What makes you think of them as sinister?

Hollywood had a lot to do with that, I’m sure. All my exposure (until about 7 years ago) with accents from your side of the pond came through entertainment. Tim Curry claimed the only roles English actors could get in Hollywood were villains and butlers. And I don’t watch things that make use of butlers.

Although, that quality of forced that you identified is probably a factor in sounding a little sinister. Like a pretty facade hiding something ugly.

Writer of fiction, blogs and erotica. Frequency in that order. Popularity in reverse.

Writer of fiction, blogs and erotica. Frequency in that order. Popularity in reverse.