Use and maintenance of restraining pens
4. The occupier of a slaughterhouse in which there is a restraining pen shall ensure that—
(a)the means of restraining and supporting a bovine animal confined in such a pen described in paragraph 3(2)(a) and (b) are used in respect of any bovine animal confined in it;
(b)the pen is kept in good working order; and
(c)if it has been modified after it has been approved by the Department, the pen is not used again until a fresh approval is given by the Department.