6.— (1) Subject to any collective agreement for the time being standing approved under section 8, an agency worker shall, for the duration of his or her assignment with a hirer, be entitled to the same basic working and employment conditions as the basic working and employment conditions to which he or she would be entitled if he or she were employed by the hirer under a contract of employment to do work that is the same as, or similar to, the work that he or she is required to do during that assignment.

(2) Subsection (1) shall not, in so far only as it relates to pay, apply to an agency worker employed by an employment agency under a permanent contract of employment, provided that—

(a) before the agency worker enters into that contract of employment, the employment agency notifies the agency worker in writing that, if the agency worker enters into that contract of employment, subsection (1), in so far as it relates to pay, shall not apply to the agency worker, and

(b) in respect of the period between assignments and subject to—

(i) Part 3 of the Act of 2000, and

(ii) any other enactment or any collective agreement that makes provision in relation to terms and conditions of employment relating to pay,

the agency worker is paid by the employment agency an amount equal to not less than half of the pay to which he or she was entitled in respect of his or her most recent assignment.

(3) Where the assignment of an agency worker commenced before 5 December 2011 and ended or ends on or after that date, that assignment shall, for the purpose of determining the agency worker’s basic working and employment conditions in accordance with subsection (1), be deemed to have commenced on that date.

(4) This section shall not operate to affect any arrangement provided for under an enactment, a collective agreement or otherwise whereby an agency worker is entitled to basic working and employment conditions that are better than the basic working and employment conditions to which he or she would be entitled under this section.

(5) In this section “permanent contract of employment” means a contract of employment of indefinite duration.