Why do you want to know alanJ? Are you a power and PA provider? If so, I should contact the organisers - this isn't really the best place to be touting for work at Sidmouth - it is just a folk forum where such subjects are discussed.

If not, do you really ask this sort of information about every event you plan to go to? If you booked a holiday cottage would you want to know who provided their gas and/or electic/water? When their pipes were last checked and their electricalgoods PAT tested. Or would you accept that it was somebody else's job - most probably the Council's Licensing Inspector, to check that theabovewas in order.   

Or perhaps you are just a S**t stirrer?