The decision of an appeals officer on any question -
(a) specified in section 247(2)(a)(i), (ii) or (iii), other than a question arising under Chapter 10 of Part II as to whether an accident arose out of and in the course of employment, and
(b) arising under Part III, IV, V, VI, VIII or this Part,
shall, subject to sections 248(1)(b), 262, 263 and 271, be final and conclusive.