"The period within which an appeal to the Appeal Tribunal may be instituted is 42 days from the date on which extended written reasons for the decision or order of the Industrial Tribunal were sent to the Appellant, or, in the case of an appeal from a decision of the Certification Officer, 42 days from the date on which the written record of that decision was so sent."
"Where an Act authorises or requires any document to be served by post (whether the expression "served" or the expression "give" or "send" or any other expression is used) then, unless the contrary intention appears, the service is deemed to be affected by properly addressing, prepaying and posting a letter containing the document and, unless the contrary is proved, to have been effected at the time at which the letter would be delivered in the ordinary course of post."