We are hoping it may not happen at all.
See the updates from Friends of the Lake District below
(from their website
https://www.friendsofthelakedistrict.org.uk/Pages/FAQs/Category/current-planning-applications)
"Update 4th December 2018
We have been assured by the National Planning Casework Unit that the Lake District National Park Authority has agreed not to issue their decision notice on the Honister Zip Wire until the Secretary of State has confirmed whether or not he will call-in the application.
15th November 2018
Friends of the Lake District is concerned about the basis for the decision to approve an application for a Dual Purpose Aerial Wire at Honister Slate Mine, and has requested that the Ministry of Housing, Communities and Local Government “calls in” this application. This means we have asked that the Lake District National Park Authority (LDNPA) is prevented from granting permission and for the application to be determined instead by the Secretary of State.
We have done this because we believe the decision was contrary to legislation relating to National Parks and to national and local planning policy. The Sandford Principle requires that in National Parks, where there is a conflict between economic and landscape interests, the requirement to conserve and enhance the landscape must be given greater weight. In coming to their decision, the LDNPA gave significant weight to the economic benefits of the proposal, but limited value was placed on the non-visual aspects of landscape character.
The decision was contrary to both the Authority’s own officer recommendations and Natural England’s objection on landscape impact grounds. The application has also been determined before a legally required assessment of the proposal’s impact on sites of international biodiversity importance has been concluded.
We await the Secretary of State’s decision on whether or not the application will be called-in. If he agrees to call-in the case, he will also confirm that an inquiry will be held and the decision will be reviewed by a Planning Inspector. If he decides not to call it in, we will work with other interested organisations to consider whether any other action can be taken.
Cumbria Wildlife Trust, ZipOff, the Open Spaces Society and CPRE all support our view and have also asked for the decision to be called in"