xmlns:atom="http://www.w3.org/2005/Atom"
18. Every appeal must be determined at a hearing before the Commission, except where—
(a)the appeal is withdrawn by the appellant;
(b)the Secretary of State consents to the appeal being allowed; or
(c)the appellant is outside the United Kingdom or it is impracticable to give him notice of a hearing and, in either case, he is unrepresented.