(1) In the case of a person disabled by a disease to which the Act applies other than a specified disease, application for reconsideration on the ground that there has been a material change of circumstances since the determination was made, shall be made, in each case, to the Secretary of State within the period of 12 months from the date on which disablement benefit became payable to that person or, if such benefit first became payable before the Act came into force, before 4th July 1980.
(2) In the case of the dependant of a person who immediately before he died was disabled by a disease to which the Act applies other than a specified disease, application for reconsideration on the ground that there has been a material change of circumstances since the determination was made shall be made to the Secretary of State within the period of 12 months from the date of the deceased's death or, if such death occurred before the Act came into force, before 4th July 1980.
(3) In the case of a person disabled by a specified disease, application for reconsideration on the ground that there has been a material change of circumstances since the determination was made shall be made in each case to the Secretary of State within the period of 12 months from the date on which disablement benefit first became payable to that person in respect of the disease or from the date of the coming into force of the order specifying the disease, whichever is the later.
(4) In the case of a dependant of a person who immediately before he died was disabled by a specified disease, application for reconsideration on the ground that there has been a material change of circumstances since the determination was made shall be made to the Secretary of State within the period of 12 months from the date of the deceased's death or from the date of the coming into force of the order specifying the disease, whichever is the later.
(5) Notwithstanding the previous provisions of this Regulation the Secretary of State may extend the period for reconsideration referred to in the said provisions for such further period as he considers appropriate, having regard to the circumstances of any particular case.
(6) In the case of a person disabled by a disease to which the Act applies or in the case of the dependant of a person who immediately before he died was disabled by a disease to which the Act applies, application for reconsideration on the ground that the determination was made in ignorance of, or was based on a mistake as to, some material fact, shall be made, in each case, to the Secretary of State within a period of 3 months from the date on which the applicant became aware that the determination appeared to be so made or so based.