Yes, providing that the request is made in writing and dated. You need to provide the information within one month of the request, clarifying the numbers of part-time workers (see question five, above) and excluded workers (for example, temporary agency workers, sub-contractors, freelancers, non-executive directors, etc) in doing so. If you fail to provide the information, or provide it in a way which is likely to mislead on the issue in question, the employees may make a formal complaint to the CAC (Central Arbitration Committee - the body that polices these arrangements).