Manner and time for the service of notices etc.
15.—(1) Any notice or other document required or authorised to be given or sent to any person under these Regulations shall be deemed to have been given or sent if it was sent by post properly addressed and pre-paid to that party at his ordinary or last notified address.
(2) Any notice or other document required or authorised to be given or sent to anappropriate social security office or office of the clerk to a tribunal shall be treated as having been so given or sent on the day that it is received in the appropriate social security office or office of the clerk to the tribunal.
(3) Any notice or document required to be given, sent or submitted to, or served on, a Commissioner—
(a)shall be given, sent or submitted to an office of the Social Security Commissioners;
(b)shall be deemed to have been given, sent or submitted if it was sent by post properly addressed and pre-paid to an office of the Social Security Commissioners.