(b) if it is provisionally of the view that it would be appropriate to approve the proposed development were certain alterations (specified in the notification referred to in this paragraph) to be made to the terms of it, notify the undertaker that it is of that view and invite the undertaker to make to the terms of the proposed development alterations specified in the notification and, if the undertaker makes those alterations, to furnish to it such information (if any) as it may specify in relation to the development, in the terms as so altered, or, where necessary, a revised environmental impact statement in respect of it.