13. Preparation of on-site emergency plans by the occupiers.

(a) in the case of a new industrial activity, before that activity is commenced, except that, in the case of a new industrial activity which is commenced or is deemed to have been commenced before a date 3 months after the coming into operation of these rules, by that date; or
(b) in the case of an existing industrial activity within 3 months of coming into operation of these Rules.