"Where an appellant brings an appeal from within the United Kingdom but leaves the United Kingdom before the appeal is finally determined, the appeal is to be treated as abandoned unless the claim to which the appeal relates has been certified under section 94(1) or (7) or section 94B."
"An appeal under section 82(1) brought by a person while he is in the United Kingdom shall be treated as abandoned if the appellant ... (b) leaves the United Kingdom."
"For the purposes of this Act an appeal under Part II shall, subject to any express provision to the contrary, be treated as pending during the period beginning when notice of appeal is duly given and ending when the appeal is finally determined or withdrawn or is abandoned by reason of the appellant leaving the United Kingdom."