Controlled airspace requirements (Class A,B,C,D,E) do not apply to UAS operating within the Open category, however a number of airspace restrictions exist within the UK and these apply equally to both unmanned and manned aircraft. These areas are referred to as either: Prohibited Areas, Restricted Areas or Danger Areas.
Within the Specific category, an operator may be required to obtain permission to enter controlled airspace within the terms of the authorisation. This is dependent on the type of operation and the mitigations provided within the safety case.