(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 -