I believe (I have forgotten ) that the quadrantal level is only applicable > 3000 AGL (bearing in mind that in Scotland you could be at FL60 and below 3000 AGL so quadrantal's do not apply).
Sorry englishal, but that's not correct. (Or, to put it another way, you are correct in thinking you may have forgotten!
)
The relevant rule is Rule 30. Load
CAP393 and scroll to page 293 in the .PDF file (Section 2, Page 19):
Quadrantal rule and semi-circular rule
30 (1) Subject to paragraph (2), in order to comply with the Instrument Flight Rules, an aircraft when in level flight above 3000 feet above mean sea level or above the appropriate transition altitude, whichever is the higher, shall be flown at a level appropriate to its magnetic track, in accordance with the appropriate Table set forth in this rule
FFF
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