1. After 4th February 2001—
(a)the licence holder shall ensure that the insulation, heating and ventilation of the premises are of sufficient quality that the air circulation, dust level, temperature and relative air humidity and gas concentrations are kept within limits which are not detrimental or likely to cause suffering or distress to any species of animals kept within the premises;
(b)all animals shall be kept in enclosures which are constructed so as to ensure their health, safety and welfare;
(c)all animals shall be housed in such a way as to protect them from suffering, harm or distress, taking into account their number, age, size, species and, where appropriate, oestrus or pregnancy state;
(d)enclosures shall be situated, maintained and cleaned in such a way as to ensure the health, safety and welfare of the animals kept within them.