“If, within the acceptance period, the appellant notifies HMRC of acceptance of the offer, HMRC must review the matter in question in accordance with section 49E.”
“In this section “acceptance period” means the period of 30 days beginning with the date of the document by which HMRC notify the appellant of the offer to review the matter in question.”
“Where an Act authorises or requires any document to be served by post (whether the expression “serve” or the expression “give” or “send” or any other expression is used) then, unless the contrary intention appears, the service is deemed to be effected by properly addressing, pre-paying 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.”