This lesson, Minibeasts in the Forest, created by the Forestry Commission, is both practical and thought provoking, especially since it addresses conservation issues alongside practical challenges.
For a great introduction to the forest and how it is cared for by the Forestry Commission, visit www.forestry.gov.uk/england-learning and look at the downloads page, where you will find an informative, child-friendly photo show, with notes and discussion questions.
You will also find some useful health and safety advice for your visit.