Here is a two lesson sequence on an Edexcel ‘key question of relevance to today’s society’ for biopsychology (zip file of all resources). It’s on the question of whether it’s a good idea to use drugs like Methadone to treat drug addiction. It assumes you’ve set advance reading on the topic. In lesson one the students debate the issue, and in lesson two they plan and write an extended response about it. The lessons are designed to help the students understand what an examiner will be looking for in their responses to this type of question, so teachers of other specifications YMMV.