5.—(1) An employee or an employees' representative may request data from the employer for the purpose of determining the number of people employed by the employer’s undertaking in the United Kingdom.
(2) Any request for data made under paragraph (1) must be in writing and be dated.
(3) The employer must provide the employee or the employees' representative who made the request with data to enable him to –
(a)make the calculation of the numbers of employees referred to in regulation 4; and
(b)determine, for the purpose of regulation 7(2), what number of employees constitutes 10% of the employees in the undertaking.