The law firm where I work is just hilarious for how polarised the accents are. It is a medium-sized UK-only firm, so hasn't gone through the process of Americanisation which has led to the other firms becoming more diverse and cosmopolitan. This place is still true blue.
The lawyers all went to public school (i.e. top private school, different meaning here) then Oxford/Cambridge, and have ridic super-posh voices, like this:
http://youtube.com/watch?v=u3G618-hxgA
Secretaries are all housewifes from Essex who left school, at best, at 18, and sound like this:
http://youtube.com/watch?v=hKL1TgoxPxc