This breed was developed during the 70-80s in England from the Lleyn of Wales using mainly the East Friesian and other breeds (the Dorset, the Bluefaced Leicester, etc.). They are used first of all in crossings to improve prolificacy and lamb rearing ability, however their weight gain is also beneficial (over 300 g). Their milk yield is excellent. They can give 150 to 400 litres of milk over a more than 200-day lactation. Weights for ewes range from 50 to 60 kg, and ram weights vary from 80 to 90 kg.