I took a PA38 from Cardiff to Halfpenny Green with another instructor. After about 20'seconds in the cruise we both became bored and decided to fly there purely using the rudder.
After about 20 minutes of self congratulations on our expert further effects aviating, it dawned on us we hadn't a clue where we were. We were shortly joined by a Gazelle, complete with angry door gunner.
Now neither of us were experts on military communications, but we both agreed it wasn't "Hi chaps, fancy a look around our new Hereford base"!