Defined activities
3. For the purpose of interpreting subsection (2)(h) of section 2 of the Act (as inserted by article 2(1) above), section 2 shall be read with the substitution for subsection (6) of the following—
“(6) Work which is carried out by a defined authority through an employee and which would (apart from this subsection) fall within a defined activity shall not do so if the total amount of such work performed by that employee occupies—
(a)in the case of an employee who is normally employed for more than 30 hours per week, less than 25% of his working time, or
(b)in the case of any other employee, less than 50% of his working time.”