The [odd] British accents in this show?
Daphne is from Manchester, in northern England - and even though her ''northern'' accent is good (Jane herself was born near London), it's nothing like Manchester, which really is like the Gallagher brothers from English band Oasis (on their US tour, the local TV stations added subtitles! Lol)
https://www.youtube.com/watch?v=4QR6u_9m5lY
I'm guessing that Jane Leeves tones it down so that Americans can understand it?
Oddly, Daphne's brothers all had the weirdest accents, to say that they were all raised in Manchester- Simon (Oz actor Anthony M. LaPaglia from 'Without a Trace') talks like a Londoner and made several references to Braveheart and ''Australia's fave son'', not something most English would brag about.
In the episode where Niles and Daphne are finally declaring their love and possibly eloping, the Moon family burst in - Stephen Moon aka Richard E Grant (S.African actor) and Michael Moon aka Robbie Coltrane (Scottish comic/actor) have other, non-northern accents.
Being an English northerner myself (not Manchester), I can tell when the actors and actresses in Frasier are Daphne's family and friends are not from Manchester, or even England.