21.—(1) These Regulations shall apply in relation to—
(a)a service provision change that takes place on or after 6 April 2006;
(b)a service provision change, not falling within sub-paragraph (a), that takes place on or after 6 April 2006 and is regarded by virtue of any statutory provision as a service provision change.
(2) The duty on a transferor to provide a transferee with employee liability information shall not apply in the case of a service provision change that takes place on or before 19 April 2006.
(3) Regulations 13, 14, 15 and 16 shall not apply in the case of a service provision change that is not also a transfer of an undertaking, business or part of an undertaking or business that takes place on or before 4 May 2006.