Use and maintenance of restraining pens
4. The business operator must ensure that—
(a)the means of restraining and supporting an adult bovine animal confined in a restraining pen described in paragraph 3(2)(a) and (b) are used in respect of any bovine animal confined in it;
(b)the restraining pen is kept in good working order; and
(c)if it has been modified after it has been approved by the competent authority, the restraining pen is not used again until a new approval is given by the competent authority.