The 'Semi-circular'/'Quadrantal' Rules apply/applied only to IFR flights
On a VFR flight, outside controlled airspace,(CAS) you can fly at any level/height/altitude you choose. (Although, it is good practice to follow the Semi-circular rule above Transition Altitude.)
When VFR inside CAS you must fly at the level/altitude allocated.
To explain the dog's breakfast of SERA/CAA Exemption, as applied to IFR, outside/below CAS, read this thread:
http://www.pprune.org/private-flying...ml#post9074525
MJ
