Sam's father Peter Woodhead thanked all the people who found his son: "We have just had so much support from friends and family. I would like to put on air the thanks we give to everyone who joined in their search effort. He owes his life to them."
More top news
Union leaders and officials from a range of campaign groups will address demonstrators as Conservative party conference gets under way.
Teachers union says workload, pay and low morale drive educators away from the profession.
Prime minister says he will 'beef up' special force and boost the use of drones in fight against terror group.