The Rules of the Air Regulations 2007

Flight in Class A airspace

18.  (1)  Subject to paragraphs (2) and (3), the commander of an aircraft flying in Visual Meteorological Conditions in Class A airspace shall comply with rules 35, 36 and 37 as if the flight were an IFR flight.

(2) For the purposes of paragraph (1) rule 36(2) shall not apply.

(3) Paragraph (1) shall not apply to the commander of a glider which is flying in Class A airspace which is notified for the purpose of this paragraph if the glider is flown in accordance with such conditions as may also be notified for that purpose.