Open Question: are you allowed to camp overnight with a campfire next to a river?

Hi my husband wants to take our children for an overnight adventure. We live in rural Norfolk and he just wants to take them to a nearby river, set up a tent, have a campfire, fish (they have fishing licence) and stay overnight. Does anyone know if any of this is against the law? My husband works as a support worker and has a clean CRB form and so does not want to put anything at risk just for a night of camping. The place he has in mind has no signs saying "no overnight stays" like some laybys and stuff have but I dont know if the lack of this makes it legal.

Please help if you can

Source:
http://answers.yahoo.com/question/index?qid=20110528104632AATM6jh

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