'High Castle' American
I've come to expect mediocre American accents from British actors in British productions, but listening to the actor playing 'Clayton Del Mar' in some scenes make a cartoon out of a 'fat cat' American accent takes it to a new low.
I'm guessing there are a fair number of less well known American actors who would be affordable and willing to take on the role, and British actors who could do the accent without damaging viewer's eardrums.