Paragraph 27 VFR flight plan and air traffic control clearance
Unless otherwise authorised by the appropriate air traffic control unit before an aircraft flies within Class B, Class C or Class D airspace during the notified hours of watch of the appropriate air traffic control unit, the commander of the aircraft shall cause a flight plan to be communicated to the appropriate air traffic control unit and shall obtain an air traffic control clearance to fly within the said airspace.
The flight plan shall contain such particulars of the flight as may be necessary to enable the air traffic control unit to issue a clearance and for search and rescue purposes.
Whilst flying within the said airspace during the notified hours of watch of the appropriate air traffic control unit the commander of the aircraft shall:
cause a continuous watch to be maintained on the notified radio frequency appropriate to the circumstances; and
comply with any instructions which the appropriate air traffic control unit may give in a particular case.
Paragraphs (1), (2) and (3) shall not apply in respect of:
any glider flying or intending to fly in Class B airspace notified for the purpose of this sub-paragraph;
any glider flying during the day in controlled airspace notified for the purpose of this sub-paragraph which remains at least 1500 metres horizontally and 1000 feet vertically away from cloud and in a flight visibility of at least 8 km; or
any mechanically driven aircraft without radio equipment flying during the day in controlled airspace notified for the purpose of this sub-paragraph which remains at least 1500 metres horizontally and 1000 feet vertically away from cloud and in a flight visibility of at least 5 km the commander of which has previously obtained the permission of the appropriate air traffic control unit to fly within the said airspace.