Funny how we still talk about the QXC. This was part of the old UK PPL that ceased in 1999. It was called a "Qualifier" because it was post the training and often the Flight Test. JAR made the ICAO 150 nm X-Ctry requirement part of the training where it has now been for 16 years! No doubt the QXC myth has been perpetuated by the ridiculous CAA certificate which was never a JAA or EASA requirement. Its original purpose being to verify an event that occurred after all training was completed.