I'm a bit confused ?!
QNH = is the pressure measured at an aerodrome reduced to sea level
QNE = Standard Pressure 1013,25
QFE = Is the pressure measured at the aerodrome
QFF = Is the pressure measured at sea level
QNH and QNE is the pressure used in aviation in Europe today. QNH below TL for arriving AC and for departing up to TA. QNE is used above TA for departing AC and above TL for arriving.
I'm not suggesting this is the best way of doing things, but it is the recognized way of doing it world wide.
In order to ensure that all aircrafts are flying enroute with the same pressure reference, QNE = 1013,25 is used. QNE is worthless when approaching an airport to land as all it gives you is your altitude above the 1013,25 reference datum. But enroute it's a good idea to use one standard as the pressure from departure to arrival can change alot.