2. Where a calf is housed in an individual stall or pen—
(a)the stall or pen shall have at least one perforated wall which enables the calf to see other animals in neighbouring pens or stalls unless isolated for veterinary reasons, except that until 1st January 2004, this shall not apply in relation to accommodation in use before 1st January 1994;
(b)the width of the stall or pen shall be no less than the height of the calf at the withers;
(c)the calf must be able to stand up, turn round, lie down, rest and groom itself without hindrance.