Children's nursery in Mountain Ash. We provide full child day care, preschool education and children's learning activities. Call 01443 474 446.child care nursery, child day care, preschool education, children's learning activities, Mountain Ash, Happy Dayz Nursery. Happy Dayz Nursery is located in the Mountain Ash area of Rhondda Cynon Taff. There are at least 2 other listings in the CF45 postcode area. Childcare Services in Rhondda Cynon Taff CF45