This would be so much easier if people would link a reference to their bold statement of fact. Or am I being naive?
https://www.bfgc.co.uk/VFR_Guide.pdf
Scroll down to page 8:
Rule 45 states that an aircraft shall not fly, take-off or land within the ATZ of an aerodrome unless the commander of that aircraft has obtained the permission of the air traffic control unit at the aerodrome or –
where there is no air traffic control unit – has obtained from the aerodrome flight information unit at the aerodrome, information to enable the flight within the zone to be conducted with safety or – where there is no air traffic control unit nor aerodrome flight information service unit – has obtained information from the air/ground radio station at that aerodrome to enable the flight to be conducted with safety.