I´m touring Europe right now and have had no problems camping out. So far I have toured in England, France and Spain and just entered into Portugule and have found some great camp sights along the way. Rain and morning dew are big issues so some kind of tent is requiered. I always set my tent up at about sunset and try and leave early. Word on the trail is that the Spanish and Portugues are cracking down on stealth camping. In France the municipale campsites are inexpensive and good so make use of them if you go there. If you are in England just ask and I am sure you will recieve a positive answer.
Anyway have a great trip.
Gordon P