The reddish-liver/white coloration in a Cavalier King Charles Spaniel was purportedly the Duke of Marlborough's favorite coloration (they also come in tri-color and ruby).
The Duke of Marlborough beat the French at the Battle of Blenheim, hence the name for the coloration.
Blenheims may also have a Marlborough spot on the top of their heads, but Bentley does not appear to have one.
Conformation freaks have wrecked goodness knows how many dog breeds.
Hopefully they don't get to this one:
This is a working dog. It is not a breed, but a type. The Dutch don't care about where the stripes are, they don't keep breed books, and they get great working dogs.