13.— Section 91 of the Principal Act is amended by—

(a) substituting the following subsection for subsection (1A) (inserted by section 11 of the Act of 2007):

“(1A) Subject to subsection (1B), a person in receipt of or entitled to injury benefit or an increase of disablement benefit under section 77 shall not engage in work.”,

and

(b) by inserting the following new subsection after subsection (1A):

“(1B) A person shall not be disqualified for receipt of injury benefit or an increase of disablement benefit under section 77 while engaging in such class or classes of employment or training and subject to such circumstances and conditions as may be prescribed.”.