I must say that I agree with NJ.
Boy Scouts, Girl Guides, outdoor "enthusiasts"....fine, but in a tent in the rain and in the UK then it is not for me. if you can't afford a B&B or a hotel........then don't go.
I have had only one experience in my younger pecuniary days....took the kids to a caravan site outside of Scarborough. In the early hours of the morning one of them wanted to go to the toilet and on opening the door on a windy, night, the urine blew back over us...........no thank you, that was enough for the sqads forever.
Hotels, B&B or...NOTHING.