There are I suppose but you take precautions. Don't pitch your tent on the edge of a river where there are crocodiles, you carry insect repellent with you, and keep a camp fire burning to keep the snakes away. I've been camping for many years and never struck a snag yet. One last tip, don't camp in a dry creek bed either you run the chance of being washed away during the night should it rain!
Are you permanently living in the UK or just doing a stint of teaching there?