Temps are now entitled to have access to the same facilities as your staff from Day One (subject to your normal company rules), and to equal pay, holidays, bonuses, etc after 12 weeks. If they have worked for you on more than one occasion. even if it was through different agencies, their assignments may be added together for the purposes of assessing their rights.
Agency workers are also entitled to be informed about current vacancies within your organisation.
Call us for clarification.