England: wild camping .

Wild camping is not legal in England, and difficult to arrange - every piece of land is private, and usually surrounded by hedge.
But there is a trick that helps you to solve the problem. There are hundreds of signposted “public walking path” , and many signposted NCN bicycle paths. Looking for a spot to crash for a night you enter any PWP or NCN and pitch your tent there. Its public status explains your presence there, and your making a camp explains by your sudden health problem that makes your going further impossible, or simply by lack of other alternatives.