This project aims to improve sampling and testing methodologies for physical contaminants in compost and digestates. Led by Dr. Thomas Aspray, the project will work with composting and anaerobic digestion facilities to determine if current sampling methods are robust. It will also study variability in contaminant test results across laboratories by testing materials with known contamination levels. The goals are to minimize variability in test results and understand if the German approach to measuring film plastics could be adopted in the UK. The project will address these objectives through site visits, statistical studies, laboratory assessments and research.