The Air Navigation Order 1995

(2) The aircraft shall fly only for the purpose of:

(a) experimenting with or testing the aircraft (including any engines installed thereon) or any equipment installed or carried in the aircraft;

(b) enabling it to qualify for the issue of a certificate of airworthiness or the validation thereof or the approval of a modification of the aircraft or the issue of a permit to fly;

(c) demonstrating and displaying the aircraft, any engines installed thereon or any equipment installed or carried in the aircraft with a view to the sale thereof or of other similar aircraft, engines or equipment;

(d) demonstrating and displaying the aircraft to employees of the operator;

(e) the giving of flying training to or the testing of flight crew employed by the operator or the training or testing of other persons employed by the operator and who are carried or are intended to be carried pursuant to sub-paragraph (7)(a); or

(f) proceeding to or from a place at which any experiment, inspection, repair, modification, maintenance, approval, test or weighing of the aircraft, the installation of equipment in the aircraft, demonstration, display or training is to take place for a purpose referred to sub-paragraphs (a), (b), (c), (d) or (e) or at which installation of furnishings in, or the painting of, the aircraft is to be undertaken.