5.—(1) Without prejudice to regulation 4, a person at work shall not enter or carry out work in a confined space unless there have been prepared in respect of that confined space suitable and sufficient arrangements for the rescue of persons in the event of an emergency, whether or not arising out of a specified risk.
(2) Without prejudice to the generality of paragraph (1), the arrangements referred to in that paragraph shall not be suitable and sufficient unless—
(a)they reduce, so far as is reasonably practicable, the risks to the health and safety of any person required to put the arrangements for rescue into operation; and
(b)they require, where the need for resuscitation of any person is a likely consequence of a relevant specified risk, the provision and maintenance of such equipment as is necessary to enable resuscitation procedures to be carried out.
(3) Whenever there arises any circumstance to which the arrangements referred to in paragraph (1) relate, those arrangements, or the relevant part of those arrangements, shall immediately be put into operation.