Don't worry bee, altimetry is a bit of a black art to most people! I remember being asked the old faithful at my NATS interview (long time ago now!) of "an aircraft parks at night with a QFE of 1003, the altimeter reads 0 feet. The next morning, the altimeter reads 150 feet. What is the airfield QFE?"
Well, at least it killed 15 minutes of interview!
And I got it wrong! (Multiplied instead of dividing and got a stupid QFE figure)
And I got the job.