Hi,
Just a piece of friendly advice: be careful about CSV owners who reply to your request. I trust there are honest CSV owners in the UK, but several (naturally not all) who have been writing here are somewhow obssessed with mixing wolf-resembling breeds, involved in suspicious businesses and other activities that would eventually lead to the destruction of the CSV breed.
As far as I know they represent neither the views and intentions of people who are responsible for the breed (i.e. breeders), nor of any official, recognized by FCI, CSV breed clubs, nor of the breed lovers who trully care for it.
Rgds
Rona