15.—(1) In prescribed circumstances, the Department or the Department for Employment and Learning may by direction given to a person subject to a requirement imposed under section 13(1) provide that the undertaking of activity specified in the direction is, in his case, to be treated as not being the undertaking of work-related activity.
(2) The power under subsection (1) to give directions—
(a)is exercisable in writing, and
(b)includes power to vary or revoke a direction given in previous exercise of the power.
(3) Where a direction under subsection (1) varies or revokes a previous direction, it may provide for the variation or revocation to have effect from a time before the giving of the direction.