24. Where an application is required to be made to more than one relevant authority for any single consent, agreement or approval under a Requirement, the undertaker may submit a request for comments in respect of its proposed application to each relevant authority and, where it does so, each relevant authority must provide its comments in writing on the proposed application within a period of 20 days beginning with the day immediately following that on which the request is received by the authority, so as to enable the undertaker to prepare a consolidated application to each relevant authority in respect of the consent, agreement or approval required by the Requirement.