The Council Contacts BBNPA

The Council Requested a Statement from the BBNPA about concerns of the Greenman Festival locating at Gilestone Farm
Their Response:
​At the current time Brecon Beacons National Park Authority (BBNPA) has not received details of any proposals for Gilestone Farm in relation to its recent purchase by Welsh Government. Consequently, it is not possible to provide comments specific to the site.
Planningandlicensingregulationsandproceduresarecomplex. Asabroadguide,the general processes which would apply to event licencing and change of use are summarised as follows:
1. Licensing of Events
The licensing authority for events in Powys is Powys County Council. Advice and guidance are available on the Council’s website: 
Licences and Permits - Powys County Council.
i. Temporary Event Notices
(TENs – Temporary Event Notices – Powys County Council)
A Temporary Event Notice (TEN) allows an applicant to carry out one or more licensable activities at their premises for up to 168 hours. TENs can be used to authorise small-scale events involving no more than 499 people at any one time, subject to certain restrictions. There is no public consultation as part of this process.
ii. Premises License 
(Premises licence - Powys County Council)
If a business sells alcohol or provides entertainment or late-night food or drink, it needs a premises licence. Large one-off events may need premises licences too. There is a consultation period of 28 days for authorities, local residents and businesses to support or object to an application.
iii. Protected Sites
If an event is planned to be held on a protected site such as a SSSI (or may impact such a site) it is the responsibility of the landowner to ensure the correct permissions are in place, this would depend on the nature of the activity. Natural Resources Wales would be the authorising authority unless planning permission is required (in which case the impact of the proposed activity would be considered as a factor within the planning permission process).
You can read more guidance on this here Natural Resources Wales / Sites of special scientific interest (SSSI): responsibilities of owners and occupiers (which also applies to SAC areas).
iv. BBNPA
BBNPA would encourage all landowners and event organisers to talk to us about holding larger events. We could provide them with advice and encourage them to consider the impacts of the event on the special qualities of the National Park which would include its environment, communities, dark skies and peace and tranquillity but we do not always have any authority or powers to enforce this as we do not grant licenses for events. In the case where an event organiser wanted to use our land, we would of course have more control and we would also be consulted if an event required closure or diversion of a public right of way.
2. Changes of Use
A material change in the use of any buildings or land is classed as development. Planning permission is generally required for a material change of use, other than for changes which fall under permitted development, for example by the Town and Country Planning (General Permitted Development) Order 1995 and related legislation, and changes where both uses fall within the same use class.
Further guidance is available via this link:
Planning Permission- Change of use - Planning Portal
Applications for planning permission are assessed against policies in the Local Development Plan Brecon Beacons National Park Local Development Plan | Brecon Beacons National Park Authority (beacons-npa.gov.uk) and other material planning considerations. The process includes consultation with statutory and non-statutory consultees and the general public.
The Planning Aid Wales website provides guidance documents specifically for communities on planning matters which may be helpful: Planning Aid Wales – Community engagement in planning