Regulation 13

the occupier intends to permanently decrease the quantity of a dangerous substance present or likely to be present in the premises of the registered major hazard installation such that the premises no longer fall within the description of a major hazard installation in the Second Schedule, not less than 14 days before decreasing the quantity of the dangerous substance; or

the occupier intends to cease occupation or use of the premises as a major hazard installation, not less than 14 days before ceasing to occupy or use the premises.