100.—(1) Subject to paragraph (2) below, any document filed in any proceedings before the comptroller may, if he thinks fit, be amended, and any irregularity in procedure in or before the Patent Office may be rectified, on such terms as he may direct.
(2) In the case of an irregularity or prospective irregularity—
(a)which consists of a failure to comply with any limitation as to times or periods specified in the Act or the 1949 Act or prescribed in these Rules or the Patents Rules 1968(1) as they continue to apply which has occurred, or appears to the comptroller is likely to occur in the absence of a direction under this rule;
(b)which is attributable wholly or in part to an error, default or omission on the part of the Patent Office; and
(c)which it appears to the comptroller should be rectified,
the comptroller may direct that the time or period in question shall be altered but not otherwise.
(3) Paragraph (2) above is without prejudice to the comptroller’s power to extend any times or periods under rule 110 or 111.