4. The business operator must ensure that a field lairage—
(a)if it is without natural shelter or shade and is used during adverse weather conditions, has appropriate protection against such conditions for any animal using it; and
(b)has drinking facilities adequate in number and size for the watering of all animals confined in the lairage, fixed where practicable, and so constructed and placed that they are easily accessible to all the animals, can readily be filled and cannot readily be fouled.