at the tour last week there were silly money expensive bikes strewn all over the place unattended, i was on my Demon which as most of you well know is pretty expensive, i took a cable lock with me, knowing i would never be far from it. i locked it to a metal fence post and removed the front wheel aswel as the cable was only long enough to go around both wheels if removed.
also i was never more then about 10 metres away from it and still kept looking over at it.
also, the reason i got a van was so that my bikes are inside it as opposed to on top of a car.