Have you seen heart certificates for the grandparents that prove they are all murmur free? Has the breeder? These claims are very easily made.
If the claims are true then I would expect the UK grandparents to all be shown on the over 5 heart clear list on the Cavalier Club website. Have you checked to see if they are there?
Claims of MRIs done on grandparents are useless, merely a pretence, lip service to health testing designed to fool puppy buyers. A responsible breeder has MRI certificates showing that the parent dogs had no SM and the tests were done when they were mature ( not just over a year old which is a common ruse in the UK )
I don't know about getting what you pay for...............When breeders ignore the SM and MVD protocols and buyers still hand over their money, it is the poor carelessly bred little cavaliers that pay the price of pain.
Cavaliers......Tommy Tuppence 2000-2012 and a half share of Faith.
Japanese Chins.... Dandy, Benny, Bridgette and Hana.