Tis true. Since I lived in Germany I now have a German driving licence. I had to give up my UK one after 12 months and swap it. Not long after the EU acknowledged that all EU licences were valid in any EU country so now no-one has to change anymore.
Back to the topic in hand. I have done Penyghent Pot twice, admittedly "only" to the terminal sump and back, and although it was a long trip (first time 11+ hours and lots of waiting about) I enjoyed every second of both trips. I have done Daren on a few occaisions, first time with a larger than average mate and only his second ever cave. No real probs then. Another occaision I wasn't wearing my "normal" caving attire and it kept getting ruckled up to the extend that 3/4 of the way through the entrance crawl I freaked myself out and had to turn back. I have since donne the crawl in 35 mins. Point is that the difficluty of a cave is more often than not a state of mind. In climbing, you can try a climb that is too hard for you, fail, go away and train, try again, fail, train more, and probably eventually you might get up it. In caving, if a passage is too small for you then you're not getting through (unless you blow it like some gits tried in Rhyd Sych). No training is getting you through.
State of mind though can vary from day to day, week to week. Fear of the unknown is one of the greatest limiting factors in caving. In the UK we have guidebooks and plans so we need rarely face that fear so can pick a cave with the physical challenges we feel comfortable with. Some choose big pitchs, some squeezes, some just go for sporty of pretty trips. Each to their own.
What I will say though is if you really want hard caving then original exploration, especially in mountainous terrain, takes some beating. Both the hardest physical cave and the hardest pyschological cave I have ever done were in the Alps and on both occaisions involved pushing trips in unknown passage. I still have nightmares from the one while the other took days to recover from the exersion..........
Mark