(1) A provision in any agreement shall be void in so far as it purports to exclude or limit the application of any provision of this Part or is inconsistent with any provision of this Part.

(2) A provision in any agreement which is or becomes less favourable in relation to an employee than a similar or corresponding entitlement conferred on the employee by this Part shall be deemed to be so modified as to be not less favourable.

(3) Nothing in this Part shall be construed as prohibiting the inclusion in an agreement of a provision more favourable to an employee than any provision in this Part.

(4) References in this section to an agreement are to any agreement, whether a contract of employment or not and whether made before or after the coming into operation of this section.