Google AQA GCSE English Language. Look for specimens or past papers for Paper 2. These are all ‘viewpoint’ non fiction texts. If that’s a winner then just google for teaching resources where teachers have selected practice texts for the same exam. It’s a key part of the curriculum (and after tackling those NF texts students then have to create their own viewpoint piece in a given topic).
Thanks so much for replying, some great suggestions and advice. I moved on to work on another section of text types so will go back to the discussion text section today. Thanks again I really appreciate your help!