The Rules of the Air Regulations 2007

Avoiding aerial collisions

8.  (1)  Notwithstanding that a flight is being made with air traffic control clearance it shall remain the duty of the commander of an aircraft to take all possible measures to ensure that his aircraft does not collide with any other aircraft.

(2) An aircraft shall not be flown in such proximity to other aircraft as to create a danger of collision.

(3) Subject to sub-paragraph (7), aircraft shall not fly in formation unless the commanders of the aircraft have agreed to do so.

(4) An aircraft which is obliged by this Section to give way to another aircraft shall avoid passing over or under the other aircraft, or crossing ahead of it, unless passing well clear of it.

(5) Subject to sub-paragraph (7), an aircraft which has the right-of-way under this rule shall maintain its course and speed.

(6) For the purposes of this rule a glider and a flying machine which is towing it shall be considered to be a single aircraft under the command of the commander of the flying machine.

(7) Sub-paragraphs (3) and (5) shall not apply to an aircraft flying under and in accordance with the terms of a police air operator’s certificate.