any notice or other document is required to be given or sent F6... to an officer authorised by the Secretary of State F1or to an officer of the Board, that notice or document shall be treated as having been so given or sent on the day that it is received F7... by an officer authorised by the Secretary of State F2or by an officer of the Board, as the case may be, and

any notice (including notification of a decision of the Secretary of State) or other document is required to be given or sent to any person other than F8... F3to an officer F8... F3an officer authorised by the Secretary of State F4or an officer of the Board, as the case may be, that notice or document shall, if sent by post to that person’s last known address, be treated as having been given or sent on the day that it was posted.