“(1) This section applies in a case where – (a) notice of appeal may be given to HMRC, but (b) no notice is given before the relevant time limit (2) Notice may be given after the relevant time limit if – (a) HMRC agree, or (b) Where HMRC do not agree, the tribunal gives permission (3) If the following conditions are met HMRC shall agree to notice being given after the relevant time limit. (4) Condition A is that the Apellant has made a request in writing to HMRC to agree to the notice being given. (5) Condition B is that HMRC are satisfied that there was a reasonable excuse for not giving notice before the relevant time limit. (6) Condition C is that HMRC are satisfied that request under subsection (4) was made without unreasonable delay after the reasonable excuse ceased. (7) If a request of the kind referred to in subsection (4) is made, HMRC must notify the Appellant whether or not HMRC agree to the Appellant giving notice of appeal after the relevant time limit. (8) In this subsection “relevant time limit”, in relation to notice of appeal, means the time limit before which the notice is to be given (but for this section).”
“For the purposes of this Act, a person shall be deemed not to have failed to do anything required to be done within a limited time if he did it within such further time, if any, as the Board or the tribunal or officer concerned may have allowed; and where a person had a reasonable excuse for not doing anything required to be done he shall be deemed not to have failed to do it if he did it without unreasonable delay after the excuse had ceased.”