There seems to be alot of unnecessary confusion about the effect of the Terrorism Act 2000. Schedule 7 applies to flights to and from the common travel area and from or to Great Britain. The requirement is fly from a designated airport or give twelve hours notice to the police. There is no requirement or power for the police to authorise the flight unless it is for hire or reward.
The common travel area is Northern Ireland, the Republic, Isle of Man and Channel Islands. The Channel Islands are the last possessions held by the Crown which once formed part of the Dutchy of Normandy. The Queen's position as the islands' head of state is often considered to be that of the Duke of Normandy and not be virtue of being Queen of England.
I don't understand how this nonsense has remained in force, since a flight to say the Channel Islands via a stop over at Le Touquet, for example, is not subject to the legislation.