I think us UK folkie crowds are a prepared to put up with a bit of risk rather than have the bloody health and saftey brigade stomping in. I remember one year at Bromyard the rain was torrential, Les Barker was performing in a marquee, the sound kept going off and the water was literally dripping off the light fittings. Were we bothered - no. Use your own common sense, if you are not happy with the situation - leave.