The Telecommunications (Licence Modification)(Standard Schedules) Regulations 1999

2.9  The Directory Information Service provided by the Licensee under paragraph 2.1 and paragraph 2.8 shall include a service or information as the case may be which the Director determines to be satisfactory where the Directory Information is made available in a form which is appropriate to meet their needs to persons who are so blind or otherwise disabled as to be unable to use a telephone directory in a form in which it is generally available to persons to whom the Licensee provides services; and the services so provided to such persons shall from the date on which this Licence enters into force be provided free of charge or, if the Director is satisfied that this is not practicable, the Licensee shall provide, in accordance with the arrangements agreed with the Director, appropriate reasonable compensation in respect of charges that are paid.