Just to reiterate previous information. Arthur’s Seat (SOTA ref; GM/SS-272) is Crown Property and written permission must be sought before transmitting from the summit, or anywhere in Holyrood Park. There does not seem to be a problem gaining permission and the Park Ranger service is very helpful.
The Park Rangers provide written permission and can now be be contacted by e-mail at email@example.com
They need to know in writing why you are seeking permission to transmit and when you intend to transmit.
The Rangers patrol the park, mainly for public safety reasons, but could potentially apprehend an illegal radio operator.