# The Rules of the Air Regulations 1991, Paragraph 22: Choice of VFR or IFR


Subject to the provisions of rule 21 an aircraft shall always be flown in accordance with the Visual Flight Rules or the Instrument Flight Rules:
Provided that in the United Kingdom an aircraft flying at night:
(a) outside a control zone shall be flown in accordance with the Instrument Flight Rules; or
(b) in a control zone shall be flown in accordance with the Instrument Flight Rules unless it is flying on a special VFR flight.

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Source: https://www.legislation.gov.uk/uksi/1991/2437/schedule/crossheading/general-flight-rulesn2/paragraph/22 (the official version)
Page: https://openlegislation.uk/rules-of-the-air-regulations-1991/schedule/crossheading-general-flight-rulesn2/paragraph-22
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.