The American Kennel Club standard for
American Water Spaniels also has indicates that the US parent club contact is:
American Water Spaniel Club
Corresponding Secretary : Linda Hattrem
Address: 5799 40th St, Princeton, MN , 55371-6440
Website Club Type: Specialty
A search also came up with a
Facts/Question sheet, but nothing for a UK breeder, which is strange considering that the breed originated in Great Britain before being introduced to the US in 1865. It is FCI registered, so perhaps you can find a breeder other than someone in the US who would be easier to import into the UK from in light of the quarantine issues.