The lead actress is British, doing Jersey accent?!
Howcum there are so many Brit, Aussie and Kiwi actors who can do convincing American accents, and so few Amercians who can do good English accents?
Because there's no shortage of Brit, Aussie, and Kiwi actors looking for work in Hollywood. Very few American actors are hired to play Brits, although I think Robert Downey Jr., Meryl Streep, Johnny Depp, Renee Zellweger, Gwyneth Paltrow, and a few others do so rather nicely, IMO.