Where immediately before a fire certificate becomes required by or under the 1971 Act in respect of any premises a fire certificate issued or deemed to be issued under regulations made under the M1Health and Safety at Work etc. Act 1974 (a “1974 Act certificate”) was in force in respect of those premises, the 1974 Act certificate shall continue in force and shall be deemed to be a fire certificate within the meaning of the 1971 Act validly issued with respect to the premises with respect to which it was issued and to cover the use or uses to which those premises were being put immediately before a fire certificate becomes required by or under the 1971 Act in respect of those premises; and, without predjudice to the generality of the foregoing, the 1974 Act certificate—